Variations in One Gene Are Known to Affect the Likelihood

Variations in one gene are known to affect the likelihood that people will consume large amounts of dairy products. The way that gene affects behavior is by influencing

A) the response of taste buds to the sugars and fats of dairy products.
B) the structure of certain parts of the brain responsible for hunger.
C) people's ability to metabolize a sugar found in dairy products.
D) the velocity of action potentials in the nerves controlling salivation.