Jose and His 78-Year-Old Grandfather Are Eating Dinner

Jose and his 78-year-old grandfather are eating dinner. Jose is amazed to see how much hot sauce his grandfather uses. When he asks about it, his grandfather says food doesn't taste as spicy as it used to. The reason is:

A) Food is actually less spicy today than it was in the past.
B) Genetic modification has altered the taste of most foods.
C) People age 70 to 85 average one-third the taste buds of young adults.
D) As people age, their taste buds become increasingly immune to highly spiced foods.