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 needle cannot penetrate into the board on the wall because the _ is hard. (A) needle (B) board
[EX A]: B

[EX Q]: Jenny found that using peroxide instead of toothpaste on her teeth gave her a better smile, because with _ her teeth were browner. (A) peroxide (B) toothpaste
[EX A]: B

[EX Q]: James scrub his skin with a towel and warm water. The _ is now dirty. (A) skin (B) towel
[EX A]:
B