This looks like an overlapping set problem, and ETS does love to use tables for overlapping sets, but we really don't need to worry about making an overlapping sets table here. Just count up all the males, count up all the juniors, and be careful not to double count the male juniors, because that is of course one of the trap answer choices (D).
Conveniently, all the males have already been added up for us and they total 860. So we just need to add the juniors who aren't males, otherwise known as females, and add them. They represent another 88 students. Since 860 + 88 = 948, C is the answer.
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