Estamos: we are
estas: you are
estan: they are
The question says where are Maria and Adela? You should change “Maria and Adela” to they, do the third option is correct.
La respuesta correcta es b
yo - era
tú - eras
él/ella - era
nosotros - éramos
vosotros - erais
Ellos/Ellas - eran
I suggest using wordreference.com for any conjugating
It’s “vengas” I’m Hispanic so I’m 100% sure it’s right
