Answer: There are two ways she figured out: 1. He would have had to hear her to know she was talking as he was focusing on driving. 2. He would not have heard her directions if he was deaf and wouldn't have nodded in response as a way to confirm he got the directions.
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There are two ways she figured out: 1. He would have had to hear her to know she was talking as he was focusing on driving. 2. He would not have heard her directions if he was deaf and wouldn’t have nodded in response as a way to confirm he got the directions.