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".

[EX Q]: The carpenter wanted to build a wall, but he didn't have enough bricks. He built a water well instead because the _ required too many bricks. (A) water well (B) wall
[EX A]: B

[EX Q]: The cat liked to play with the laser pen, but not with the cat wand, because the _ is more entertaining. (A) laser pen (B) cat wand
[EX A]: A

[EX Q]: Brian taught Michael in the classroom, because _ was the student and spent their time learning. (A) Brian (B) Michael
[EX A]:
B