How Do We Hear the Difference Between Two High-Pitched Sounds

Multiple Choice

How do we hear the difference between two high-pitched sounds (such as 8000 Hz and 9000 Hz) ?​

A) The sounds produce activity in different parts of the basilar membrane.
B) ​The sounds produce different frequencies of action potentials in the auditory nerve.
C) ​The sounds produce different ratios of firing between the left and right ears.
D) ​The sounds produce different velocities of action potentials in the auditory nerve.