My parents … together at one school for five years before they moved to Moscow. A. Had...

Question

My parents … together at one
school for five years before they moved to
Moscow.
A. Had studied.
B. Studied.
C. Had been studying.

Answer 1

A. Had studied думаю это

Answer 2

Это past perfect т.к действие происходило перед определённым, значит A. Had studied