Which Statement About the Senses of Taste and Olfaction Is

Which statement about the senses of taste and olfaction is incorrect?

A) An odor typically contains only a type single odor molecule that activates one specific type of receptor protein.
B) There are at least four primary types of taste: sweet,sour,salty,and bitter;there may also be a fifth taste,called umami.
C) Taste cells and olfactory cells are chemoreceptors.
D) Each olfactory cell has only 1 out of 1,000 different types of receptor proteins.
E) A taste bud has both supporting cells and a number of elongated taste cells that end in microvilli.