Imagine a Graph Showing Fluid and Crystallized Intelligence Scores as a Function

Multiple Choice

Imagine a graph showing fluid and crystallized intelligence scores as a function of age. Age appears on the x-axis, with increasing age toward the right. One curve portrays fluid intelligence scores; the other, crystallized intelligence scores. Which statement BEST describes the relationship between the two curves as age increases?

A) The curves converge.
B) The curves remain parallel.
C) The curves diverge. The slope of the fluid intelligence curve eventually becomes increasingly negative, whereas the slope of the crystallized intelligence eventually becomes positive.
D) The curves diverge. The slope of the crystallized intelligence curve eventually becomes increasingly negative, whereas the slope of the fluid intelligence eventually becomes positive.