Sales Promotions Cannot Be the Sole Basis for a Promotional

Sales promotions cannot be the sole basis for a promotional campaign because

A) all sales promotions have legal time limit restrictions to prevent unfair trade practices.
B) gains from sales promotion are often temporary and sales drop off when it ends.
C) sales promotions are too costly and soon become a financial liability.
D) sales promotions are traditionally handled by outside firms and not the manufacturer,which often results in a significant loss of profit.
E) consumers obtain an inflated impression of a product's actual value or worth.