An ad for Tums antacid shows a patron at a diner asking for Tums to alleviate his heartburn. The waitress points to a bowl that is filled with a jumble of Maalox, Rolaids, Tums and other antacids. The waitress says that all antacids are the same, and the patron then explains her to that Tums is the only antacid that has calcium. Tums is using:
A. one-sided advertising.
B. two-sided advertising.
C. comparative advertising.
D. verbal appeals.
E. refutation.
Answer: C