Which of the Following Statements Is TRUE About Activity Theory

Which of the following statements is TRUE about activity theory?

A) This theory focuses on individual differences in the physical changes that go with aging.
B) The central assumption of this theory is the more activity one engages in old age, the greater the sense of life satisfaction.
C) The theory states older people need to work, either for pay or as volunteers, to promote their well-being.
D) The theory states that successful aging involves mutual withdrawal between the individual and society.