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 man worked for hours to clean the carpet with his vacuum, but the _ didn't work. (A) carpet (B) vacuum
[A]: B

[Q]: Megan liked to read a book good more than Samantha because _ hated the peace and quiet. (A) Megan (B) Samantha
[A]: B

[Q]: Elena stopped being friends with Katrina because _ was very selfish and never reciprocated the favors and help she was received. (A) Elena (B) Katrina
[A]:
B