It Is Generally the Case That Most Great Scientists Have

Multiple Choice

It is generally the case that most great scientists have their ground-breaking ideas when they are in early to middle adulthood, but rarely when they are older. What might explain this fact?

A) The brain shrinks with age.
B) General intelligence declines steeply after middle adulthood.
C) Fluid intelligence peaks in middle adulthood, and then declines in later life.
D) Crystallized intelligence peaks in middle adulthood, and then declines in later life.