I'll give you a question, please answer with step-by-step reasoning process.
Pick which sentence is not logical.\nOptions:\n- Sentence A: "Ben wants to teach piano because he has been playing the piano since he was five years old"\n- Sentence B: "Ben wants to teach piano because he has been playing the violin since he was five years old"\n

Sentence B
Ben would only be able to teach the violin properly.

.

The answer: Sentence B