In this task, you are given a question containing a blank (_) and two options. You should pick the best option to answer the question. Please answer with "A" or "B".

I don't know why I used paper to write my essay instead of computer, it's convenient to edit on the _ . (A) paper (B) computer
B

Jeffrey fed their guinea pig alfalfa, while Robert watched from a distance. _ loved guinea pigs. (A) Jeffrey (B) Robert
A

He thought he lost his marbles in the dream world, but the _ were in his pocket the entire time. (A) marbles (B) dream world
A