What is the purpose of advertising?

In what situation is a chalk or marker board a particularly good presentation aid?

A) when you haven?t had time to prepare B) when you want to impress your audience with your impromptu skills C) when there is a need to kill time D) when feedback tells you listeners don?t understand something

Describe the social desirability effect and why it could be detrimental.

What will be an ideal response?