Which question is most likely to be found in a dichotomous key for identifying a tree by its leaves?

A dichotomous key identifies organisms through a sequence of questions with two contrasting choices. Choice C asks whether the leaf bases are attached opposite each other, which can be answered yes or no and is a useful feature for distinguishing trees. Choice A asks about shape but does not give two distinct alternatives; choices B and D concern birds or an inferred function rather than a clear identifying feature.

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