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".
One example: Katrina gave Christine a stuffed animal for their birthday, but _ already had this one. (A) Katrina (B) Christine
Solution is here: B
Explanation: Since the blank is someone who received the gift and already had a stuffed animal, the answer must be "Christine".

Now, solve this: Jennifer came limping into work but not Rebecca because _ had worked out too hard. (A) Jennifer (B) Rebecca
Solution:
A