If you still need help the answer is b if you are talking for multiple people. But if you Are talking about only one person its c
you don't give options but try with this
Nuestra casa __ESTA__________________ en la calle Bolívar.
eso no se puede ver completo no entiendo como quieres que te ayuden sorry pero no puedo ayudarte Xd
The answer is “era” as in past tense
