C is the correct answer for this question. Guilt can hide what people want to do and prevent them from doing it ever again.
If your asking what *pachyderm means.
then it means a very large animal with thick skin, like an elephant or rhino.
The pronoun is "it" and the antecedent is "a miniature glass hippopotamus".
Extra information:
The word antecedent is composed out of two Latin words: ante and cedere, and it literally means: the "preceding", meaning it refers to the word that precedes the pronoun, that the pronoun refers to. This is not important for the question, but it is important to remember that the antecedent is always in front of the pronoun!
