Regarding Adult Crystallized Intelligence and Fluid Intelligence, Which of the Following

Regarding adult crystallized intelligence and fluid intelligence, which of the following statements is TRUE?

A) Both types of intelligence generally increase throughout the adult life span.
B) Both types of intelligence generally decrease throughout the adult life span.
C) After early adulthood, fluid intelligence generally decreases, while crystallized intelligence stays about the same or increases.
D) After early adulthood, crystallized intelligence generally decreases, while fluid intelligence stays about the same or increases.
E) Both types of intelligence decrease, but only in late adulthood.