Trends in Both Crystallized and Fluid Mental Abilities Reported from the Seattle

Multiple Choice

Trends in both crystallized and fluid mental abilities reported from the Seattle Longitudinal Study indicate that middle-aged adults __________.

A) show steady increases in nonverbal IQ
B) often overestimate their intellectual abilities
C) are intellectually "in their prime," not "over the hill"
D) show sharp decrements in ability, starting around age 40