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]: 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]: Rebecca showed Jennifer how to heal a fever by herself.  _ sure was knowledgeable. (A) Rebecca (B) Jennifer
[EX A]: A

[EX Q]: During the annual competitive biking race Victoria went rushing past Lindsey when _ was tired. (A) Victoria (B) Lindsey
[EX A]:
B