It is also true that the effect of a drug is much __ upon youngsters than adults.A in;B fewer;C after;D until请问一下该选哪一个.

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It is also true that the effect of a drug is much __ upon youngsters than adults.
A in;B fewer;C after;D until
请问一下该选哪一个.

answer is B
药物对成人的影响比对青年人的影响更大.