What can be said of "price fixing"?

What can be said of "price fixing"?

A.It is part of pricing activities,but has nothing to do with marketing mix.

B.The activity of price fixing occurs when companies try to lower prices to compete with each other.

C.Price fixing occurs when companies decide on the price of their products.

D.Price fixing is considered against the U.S.law.

正确答案是D