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".

Example input: Katrina gave Christine a stuffed animal for their birthday, but _ already had this one. (A) Katrina (B) Christine
Example output: B
Example explanation: Since the blank is someone who received the gift and already had a stuffed animal, the answer must be "Christine".
Q: Christine hated the heat, but Mary loved it, so _ was thrilled when they went on vacation in Africa. (A) Christine (B) Mary
A:
B