Which of the following best describes the effect of a contingent fee arrangement on the auditor's independence?

A$.$ The contingent fee arrangement does not impair independence if it is consistent with the registered

public accounting firm's quality control policies.

B$.$ The contingent fee arrangement impairs independence.

C$.$ The contingent fee arrangement does not impair independence unless more than half of the fee is

subject to contingencies.

D$.$ The contingent fee arrangement impairs independence unless approved by the client's audit

committee.