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]: Jeffrey took the time to caulk their windows but Robert didn't bother. _ saw their electric bill decrease. (A) Jeffrey (B) Robert
[EX A]: A

[EX Q]: Amy was dreading the beginning of the school year but not Betty because _ was smart. (A) Amy (B) Betty
[EX A]: B

[EX Q]: Derrick took a small loan from William, so _ made sure to pay them back on time. (A) Derrick (B) William
[EX A]:
A