A Major Reason That Marketers Are Concerned with What People

A major reason that marketers are concerned with what people say about a product is that word- of- mouth communication:

A) is not as effective as advertising
B) tends to be more powerful than information received on formal promotion channels
C) does not move very rapidly throughout the country
D) is easier to control by the marketer than other means of communication
E) can be purchased relatively inexpensively by the marketer