Taste buds that are more sensitive to sweet flavors than to others are located
select one:
a. all over the tongue, as sensitivity to sweet is distributed throughout the tongue
b. on the tip of the tongue
c. on the back of the tongue
d. on the side of the tongue

b. On the tip of tongue.

Explanation:

The taste buds are present on the sensary organ that is tongue. On tongue taste receptor cells or taste buds in the form of papillae are present which detect different tastes. These receptors can detect taste stimuli like salty, sweet, bitter, sour and umami. Sweet is detected by the receptor cells or taste buds in the front of tongue. Sour and salty on the sides and in the back bitter taste can be detected.

thermophiles, notice the prefix thermo.

the answer is d (apex) good luck : ))