As John was leaving the show, he was unable to hear his friend talking next to him in a normal conversational tone of decibels since the rock concert was well over 130 decibels.

60 decibels

Explanation:

Human Hearing depends on sound which is measured in decibels. A very loud sound can cause severe damage or temporary deafness to the ear. A normal human conversation level is about 60 decibels. A higher frequency of noice than this could cause cause the ear not to hear at the normal rate of 60 decibels

a.. a conflict between her competing identities.. apex

the answer your looking for is c. : )