I need more info to answer this question
i am not an expert in health but i think it is B
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First base is the only base where a runner can return to it, and where it can be overrun
1) outer ear
2) ossicles
3) idk
4) eardrum
5) idk
6) semiciular canals
7) cochlea
8) auditory nerves
9) idk
10) idk
11) eustation tube
12) ear canal