While Sales Promotions Play an Important Part in the Marketing

While sales promotions play an important part in the marketing mix,they also:

A) typically stimulate repeat purchases.
B) are poor sources of primary research data.
C) are relatively inexpensive when compared to the CPM cost of media vehicles.
D) tend to draw the competition into a price wars.
E) are ineffective if the advertiser sets its budget using the objective-and-task method.