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".

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
B

The teacher of Nick was a lot smarter than Robert's teacher, because _ teacher has several degrees. (A) Nick (B) Robert
A

Maria placed the book in Monica 's locker because _ 's locker was full at the time. (A) Maria (B) Monica
A