Evidence pertaining to the airline industry suggests that

Group of answer choices

a. since the airlines have become deregulated, airline fares have increased steadily.

b. under regulation the airlines' fares were low, which indicates that the regulators were doing a good job setting prices.

c. airline fares are no higher and no lower than they were when the industry was regulated.

d. deregulation of the airline industry has brought significant price reductions.