Eu responderia 50% (C).
O motivo para minha resposta é que das 4 (ABCD) possibilidades, 2 estão inválida (BD). Sobrando só (AC). E 1 certa em 2 possibilidades reais é 50% de chance (Escolho C).
@slh C 50%.. I would rule out B right away leaving only 25% and 50% as potential answers, to satisfy the question and pick at random I would now randomly pick one of those. Since there are only two choices, 25% or 50% i know that only 50% must be correct of these two, and thus 50% is the answer.
We can likewise know that is the only answer because I as far as I can tell there is no other scenario, no matter how convoluted (and that was pretty damn convoluted) that would give an answer :)
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