Which of These Is NOT a Major Advantage of Personal

Which of these is NOT a major advantage of personal selling as compared with advertising?

A) Personal selling has less waste than advertising.
B) Personal selling is less costly than advertising on a per prospect reached basis.
C) Personal selling centers on a more defined and concentrated target market.
D) Those who walk into a store or who are contacted by personal selling are more likely to purchase a product than those who have watched a commercial.