Research evaluating the effectiveness of various forms of psychotherapy for older adults has found that:

A. older adults respond less well than younger adults to most forms of psychotherapy.
B. older adults respond much better than younger adults to most forms of psychotherapy.
C. older adults respond to a comparable degree as younger adults to most forms of therapy, although older adults may respond more slowly.
D. older adults respond to a comparable degree as younger adults to most forms of therapy, although older adults may respond more quickly.