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: I don't know why I used paper to write my essay instead of computer, it's convenient to edit on the _ . (A) paper (B) computer
Solution:
B
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: I don't know why I used paper to write my essay instead of computer, it's convenient to edit on the _ . (A) paper (B) computer
Solution:
user
B
assistant
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: I don't know why I used paper to write my essay instead of computer, it's convenient to edit on the _ . (A) paper (B) computer
Solution:
B