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]: It was easy for Samantha but not Rachel to pass the class because _ took all the necessary steps to study and complete assignments. (A) Samantha (B) Rachel
[EX A]: A

[EX Q]: Sarah was constantly feeling dizzy but not Betty because _ did not have symptoms of vertigo. (A) Sarah (B) Betty
[EX A]: B

[EX Q]: Rachel wasn't good at Science like Betty.  _ failed the big science exam that was needed to go onto next grade. (A) Rachel (B) Betty
[EX A]:
A