He forgets about the report and tries to figure out who is involved in the argument. He was hearing a group of answer options when he first heard the argument. Option an is the correct response.
Hearing is the awareness of the presence of sounds and the assignment of meaning to those sounds. It starts with vibrations that travel through your ear (outer, middle, and inner ear) and nerves to your brain, where you hear. Sound waves enter the outer ear and travel through a narrow passageway known as the ear canal to the eardrum. The incoming sound waves cause the eardrum to vibrate, and the vibrations are transmitted to three tiny bones in the middle ear.
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