Check and uncheck of checkboxes

I have three division and each division contain 3 checkboxes.

<div class="options">
                                <div class="offers" >
                                    <form action="" >
                                        <div class="multiselect">
                                            <div class="selectBox click">
                                                <select class="select">
                                                    <option>Select an option</option>
                                                </select>
                                                <div class="overSelect"></div>
                                            </div>
                                            <div id="open" class="box">
                                                <input type="checkbox" id="one"/><label for="one" class="i">First checkbox</label>
                                                <input type="checkbox" id="two"/><label for="two">Second checkbox </label>
                                                <input type="checkbox" id="three"/><label for="three">Third checkbox</label>
                                            </div>
                                        </div>
                                    </form>
                                </div>
                                <div class="offers">
                                    <form action="">
                                        <div class="multiselect" >
                                            <div class="selectBox click">
                                                <select class="select" >
                                                    <option>Select an option</option>
                                                </select>
                                                <div class="overSelect"></div>
                                            </div>
                                            <div id="open" class="box">
                                                <label for="one"><input type="checkbox" id="one"/>First checkbox</label>
                                                <label for="two"><input type="checkbox" id="two"/>Second checkbox </label>
                                                <label for="three"><input type="checkbox" id="three"/>Third checkbox</label>
                                            </div>
                                        </div>
                                    </form>
                                </div>
                                <div class="offers">
                                    <form action="">
                                        <div class="multiselect">
                                            <div class="selectBox click">
                                                <select class="select">
                                                    <option>Select an option</option>
                                                </select>
                                                <div class="overSelect"></div>
                                            </div>
                                            <div id="open" class="box">
                                                <label for="one"><input type="checkbox" id="one"/>First checkbox</label>
                                                <label for="two"><input type="checkbox" id="two"/>Second checkbox </label>
                                                <label for="three"><input type="checkbox" id="three"/>Third checkbox</label>
                                            </div>
                                        </div>
                                    </form>
                                </div>
                            </div>

I have used label so that if i click on label checkbox get check. But its happening only in first div and in other div if click on label changes occur in first div. And also if i click on label on other div other than first checkbox are not checking