Add checkbox to strike-through each alternative of a multiple-question on qconcursos.com

qconcursos.com has many multiple alternative questions, like this one (https://www.qconcursos.com/questoes-de-concursos/questao/ccc0b219-43), but it lacks an option to eliminate a wrong alternative (like strike-through or fade), which could be extremely helpful. This other site (https://questoes.olhonavaga.com.br/questoes?id=750968&tc=1) has a very neat solution (the "x" by the right of each alternative) that I would like to mimic on qconcursos.com (a simple strike-through command achievable by a checkbox would be enough), but I have absolutely no idea on how to do that. Can anyone do a userscript for Tampermonkey or anything else to achieve that, please?