Умоляю помогите мне the students .....a lot of money for a peruvian zoo before they...

Question

Умоляю помогите мне
the students .....a lot of money for a peruvian zoo before they ..... there
A) have raised, went
B) had raised , went
C) are raised, had gone
D) had raised, had gone

Answer 1

B!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 2

Ответ b,потому что студенты сначала заработали денег(Past Perfect), а потом уже пошли в зоопарк(Past Simple).