Which of the Following Is True

Which of the following is true?

A) Trademark protection can be lost if a trademark becomes used generically.
B) Under the "fair use" doctrine, trademarks can be used in certain limited ways without the trademark holder's permission.
C) Selling a trademarked item to many buyers can result in loss of the trademark.
D) Terms such as "Mustang" cannot be trademarked, because they consist of only generic words.
E) Trademark protection is not recognized in about one-half of the states.