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]: Aaron drank plenty of water before the hike, but Christopher forgot to, so _ ended up getting dehydrated. (A) Aaron (B) Christopher
[A]: B


[Q]: Katrina trained Tanya to do aerobic exercise because _ was a trainer in great shape. (A) Katrina (B) Tanya
[A]: A


[Q]: Robert is much better at sewing than Christopher since _ is well-trained and did an apprenticeship under a known seamstress. (A) Robert (B) Christopher
[A]:
A