The answer will be “Lilas”
Answer: Esta
Explanation: there’s not a lot of context but it makes sense because esta means “is” and the sentence would translate to “he is in the class”
Some of the books are about the process of adapting to a different culture
I believe it’s b) hublera insistido
a) says “you would have insisted”
c) says “they would have insisted”
d) says “we would have insisted”