An Ad for a New Strawberry-Flavored Coffee Had a Toll-Free

An ad for a new strawberry-flavored coffee had a toll-free number that could be called to request a free sample of the coffee. If the manufacturer of the coffee counted how many free samples were given away, it would be able to measure the effectiveness of the ad. This would be an example of a(n) _____ test.

A) pioneering
B) direct
C) aided recall
D) introductory
E) response