Suppose you hear someone say, "Intellectual skill is

maintained, with no psychologically significant loss, until about age 60 or 65, after which there is a small decline." You are convinced that this is an overly optimistic view. Which of the following statements would be your most potent counterargument?
a. Cross-sectional data show a decline much earlier than age 60 or 65.
b. In longitudinal studies, earlier declines appear for tests that measure speeded or fluid abilities.
c. Studies of terminal drop indicate that declines occur only within 5 years of death.
d. Declines begin earlier than this for adults with significant health problems.

B