Question

publicity differs from advertising in that publicity is
a free.
b more expensive than advertising.
c always true.

Explanation:

To determine the correct answer, we analyze the differences between publicity and advertising. Publicity typically involves gaining media coverage (e.g., news stories, press releases) which is often free, while advertising requires paying for ad space/time. Option B is incorrect as publicity is generally less costly or free, not more expensive. Option C is vague and not a valid distinction. Option A correctly states that publicity is free (in terms of direct payment for the media coverage, though there may be costs in creating materials for publicity).

Answer:

A. free.