The goal of the Proportional Representation of Diversity index was to examine the distortion in representation of various co-cultures "across the demography of the media landscape."

All of the following are true of visual aids EXCEPT that:

a. visual aids can reduce a speaker's reliance on notes. b. visual aids are often used to contradict ideas presented verbally. c. visual aids do not prove a claim, but they make the claim more clear and understandable. d. they increase listeners' understanding and retention of ideas presented in a speech.

Which sound element is manipulated to make the background music you may hear in a

restaurant or while on hold during a phone call so unobtrusive?

What will be an ideal response?