In a Perfectly Competitive Market,the Type of Decision a Firm

Multiple Choice

In a perfectly competitive market,the type of decision a firm has to make is different in the short run than in the long run.Which of the following is an example of a perfectly competitive firm's short-run decision?

A) the profit-maximizing level of output
B) how much to spend on advertising and sales promotion
C) what price to charge buyers for the product
D) whether or not to enter or exit an industry
E) whether or not to change its plant size