is this correct?

"Cuando eras niña, ¿dónde trabajan tus padres?" "Mis padres _____ profesores en una universidad."
a. eran
b. iban
c. trabajaban
d. hacían

is it A
?

yes

Yes, the correct answer is A. "Cuando eras niña, ¿dónde trabajan tus padres?" translates to "When you were a child, where did your parents work?" The sentence "Mis padres eran profesores en una universidad" translates to "My parents were professors at a university." The verb "ser" is used to describe permanent or inherent characteristics, such as profession, so "eran" is the appropriate conjugation in this context.