Which of the Following Is a True Statement

Multiple Choice

Which of the following is a true statement?

A) There are four kinds of taste receptors, each corresponding to one of the four primary taste qualities.
B) The middle of the tongue is most sensitive to sourness.
C) The tongue's papillae contain the taste buds that in turn contain receptor cells for the sense of taste.
D) All areas of the tongue are equally sensitive to each of the primary tastes.