According to Cattell, If We Examine the Intelligence of a Person

According to Cattell, if we examine the intelligence of a person at age 20 and again at age 50, we are most likely to find

A) consistent levels of both fluid and crystallized intelligence.
B) the same amount of fluid intelligence, but less crystallized intelligence at age 50.
C) lower levels of fluid intelligence at age 50, but more crystallized intelligence.
D) more fluid intelligence at age 50, but less crystallized intelligence.