Answer:
b. Frank got his driver's license at age 16
Explanation:
Age-graded influence are influences that affects an individual according to their age, they are correlated to the individual chronological age. For example, at 16 an individual is eligible for drivers license in the United states, and at 66, an individual is likely to retire. these influences are linked to the individuals age. Frank getting is driver license at 16 is an age graded influence.