For all the benefits gained from exercise, people generally show declines in physical activity with age. explains this by pointing to the societal pressures that keep people from an active life style through narrow notions of what older people should and shouldn’t do.

Age stratification theory explains this

Explanation: Age stratification theory refers to the classification of people in a society into socioeconomic levels.

Age stratification theory explains what different age groups can and can't do.

the answer to this question is d

answer; being clearly political;