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 red wine stain stood out on the white carpet because the _ was very light. (A) stain (B) carpet
[EX A]: B

[EX Q]: Aaron went to pick up Michael, who needed a ride to the airport, and _ was very grateful. (A) Aaron (B) Michael
[EX A]: B

[EX Q]: Neil really wanted to go to sleep but Christopher did not because _ was feeling very tired. (A) Neil (B) Christopher
[EX A]:
A