What is "phase distortion" in signal processing?

A) The delay of a signal

B) The change in amplitude of a signal

C) The non-linear change of phase with frequency

D) The change of frequency over time

Answer: C) The non-linear change of phase with frequency

Explanation: Phase distortion occurs when different frequency components of a signal experience different amounts of phase shift, which can lead to distortion of the signal waveform and affects the quality of the output.