People with Congenital Amusia Often Exhibit Which Characteristic

People with congenital amusia often exhibit which characteristic?

A) Lower concentration of grey matter than normal in the right inferior gyrus of the frontal lobe
B) Higher concentration of white matter than normal in the Heschl's gyrus
C) Delayed neural responses in the auditory cortex when perceiving pitch
D) Lower thresholds than normal in detecting two tones that differ in pitch