A simple way to solve all such CR questions is to find a statement which changes the conditions of the original experiment - because logically if the experiment was not conducted with the proper sample space - it cannot be used to reason an argument.
In this case - if D is correct or wrong, messes with the sample of students on which the experiment is based. Therefore, it is the most important point for the argument to hold true.
This is a universal rule - and applies to all CR questions.
...
In this case - if D is correct or wrong, messes with the sample of students on which the experiment is based. Therefore, it is the most important point for the argument to hold true.
This is a universal rule - and applies to all CR questions.
...
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