Given the task definition, example input & output, solve the new input case.
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: Katrina gave Christine a stuffed animal for their birthday, but _ already had this one. (A) Katrina (B) Christine
Output: B
Since the blank is someone who received the gift and already had a stuffed animal, the answer must be "Christine".

New input case for you: Wren solved the math problem using the calculator instead of the smartphone because the _ was intuitive. (A) calculator (B) smartphone
Output:
A