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!
Answer:
the solution is A
they make people sleep sometimes they sleep forever
I
Am
A
Man
Martin
Luther
King
Jr
Once
Said
If you know anyone who speaks tamil, practice with them! Also, I find watching and listening to songs and movies helps with pronunciation.