If You Were to Put a Piece of Sugar on the Central

If you were to put a piece of sugar on the central area of your tongue, you would not be able to taste the sweetness. This is because:

A) there are no taste receptors at this location.
B) the central part of the tongue is sensitive only to bitter tastes.
C) taste cells in this location are less sensitive than in other locations.
D) the central part of the tongue is sensitive only to sour tastes.