Ramone and Sam Are Going to a Concert

Ramone and Sam are going to a concert.As they walk to the concert,they talk to one another in normal tones.But after they enter the arena,they discover that they practically have to yell at each other to continue their conversation.This example represents a change in

A) signal detection capabilities.
B) listener-to-audience ratio.
C) signal-to-noise ratio.
D) auditory transduction interference.