Which of the Following Statements About Sales Tests Is True

Which of the following statements about sales tests is true?

A) With sales tests, additional product information, product samples, or premiums are offered to an ad's readers or viewers, and ads generating the most inquiries are presumed to be the most effective.
B) With sales tests, a question such as, "What ads do you remember seeing yesterday?" is asked of respondents without any other prompting to determine whether they saw or heard advertising messages.
C) Sales tests involve studies such as controlled experiments and consumer purchase tests to measure actual purchases.
D) In a sales test, respondents are asked questions to measure changes in their attitudes after an advertising campaign, such as whether they had a more favourable attitude toward the product advertise