Answer:
I believe that it's (a) cerebellum
Explanation:
"The cerebellum controls voluntary movements such as posture, balance, coordination, and speech."
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I’m going to try to give this to you via comment section because it includes too many words.
(Now, this is something I pulled off the web. You could turn this in, but I don’t recommend that. Just read over this instead of the actual book if you don’t have enough time, and rewrite some of it in your own words, or rewrite it all yourself based on this.)