What Process Allows Us to Hear Pitch,according to Place Theory

What process allows us to hear pitch,according to place theory

A)  There is differential movement of specific ossicles. 
B)  The entire cochlea vibrates at a speed equivalent to the wavelengths that stimulate the ear. 
C)  Vibrations occur at specific locations on the basilar membrane. 
D)  Specific hair cells are simultaneously stimulated all along the length of the semi-circular canals.