Ayer Nora y yo comimos la cena en la cabaña.
Comimos is the plural form of comer and means to eat, Nora and I ate...
Claudio y yo llegábamos al hostal cuando el portero cerró la puerta.
Cerró is singular and in third person (he did), it means to close and is also in past. He closed the door.
Tú reservaste la habitación individual el mes pasado.
Reservaste is to book something, it’s in second person and in past. You booked the room...
Yo llegué en mi auto al hostal a las cinco de la tarde.
Llegué, first person and in past. It means to arrive somewhere. I arrived in my car...
I know the second one is present tense
The form nosotros means we and the verb form would end in amos because pensar is an ar verb.
The correct answer is B
If you are referring to the United States, it would be A. If you are referring to Mexico, it would be B.