I believe the answer is otherwise
Minutia means a small piece of information which might not be entirely significant. Its plural form is “minutae”.
Sample sentence: It’s essential that everyone should know the overview of the entire system; however, you need not to focus on the minutiae of everything.
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Basically, minutia is a small detail, so (A) a significant idea and (B) an influential person are obviously not the answers. Between C and D, C can be the closest because of the word “simple”. A minutia can be an explanation or instruction but its core essence if insignificant. So, C is the best answer. </span>
