What are dried grapes known for that makes a teacher like them

Seems like the question is a riddle about what is the name of dried grapes which make teachers like them. The answer is "raisin", raisin is the name of the dried grapes and "raisin hands", has a monophony with "raising hands", which usually teachers are known for and because of the similarity between sounds "raisin hands" is the answer.

the answer is C.

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