You will be given a definition of a task first, then some input of the task.
In this task, you are given an impractical statement. You are also given three reasons (associated with "A", "B", "C") explaining why this statement doesn't make sense. You must choose the most corresponding reason explaining why this statement doesn't make sense.

I can talk to others without opening my mouth.
(A) One of the things you do when you talk to someone is open your mouth.
(B)It's hard for others to understand you if you don't open your mouth.
(C)You can't make sound if you don't open your mouth.
Output:
A