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".

[Q]: The medical exam for the broken arm was longer than the exam on the heart because the _ was a serious problem. (A) heart (B) arm
[A]: B

[Q]: Brian didn't want to dissect the cow brain with Benjamin, because _ thought they could find a better lab partner. (A) Brian (B) Benjamin
[A]: A

[Q]: Monica hated giving speeches in school unlike Betty because _ was a lot less confident. (A) Monica (B) Betty
[A]:
A