On a question like this, it just so happens my work from question 2 allowed me to answer number 3. In a hypothetical situation, if that is not the case then how would one avoid wasting time by going through each answer choice?
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When you're not able to use prior work AND none of the initial deductions end up being helpful, which is admittedly not common), cannot be true questions are often one of the most time consuming. I personally find it useful to try to knock out the answers that are clearly impossible, and not worry about finding the thing that could be true. This is a process of elimination friendly question type. I would usually hint for the answer choices that immediately conflict with the setup or a deduction, and then try to eliminate based on past work. I'm also personally a fan of leaving cannot be trues for last, to enable us to use work from past questions.
