In a Study of Whether Prices Are Sticky or Not,Alan

In a study of whether prices are sticky or not,Alan Blinder supervised interviews of corporate executives on the frequency with which their firms change prices and found that

A) 55 percent of firms changed prices only once a year or less.
B) over 20 percent of the firms changed prices more than 12 times per year.
C) 10 percent of companies changed prices 4 to 12 times per year.
D) there is not a considerable departure from auction-market behavior.