Michael Wanted to Develop a Sales Promotion to Draw Customers

Michael wanted to develop a sales promotion to draw customers into the store and increase sales for the month,but he was also aware of the downside of sales promotions,specifically that:

A) his suppliers might not be able to meet the demand.
B) consumers might simply stock up on the products and sales in future months would correspondingly decline.
C) competitors might match the promotion resulting in a price war.
D) if used too often,consumers will expect the promotions and not buy until one is available.
E) all of these.