Which of the Following Statements About Unaided Recall Post-Tests Is

Which of the following statements about unaided recall post-tests is true?

A) With unaided recall post-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) Unaided recall post-tests involve studies such as controlled experiments and consumer purchase tests.
C) In an unaided recall post-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 advertised.
D) With unaided recall post-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.