Which of the following is true about the relationship between the brain and intelligence scores?

A) Brain size, but not the degree of convolution, is correlated with intelligence scores.
B) The degree of convolution, but not brain size, is correlated with intelligence scores.
C) Both the size and degree of convolution of the cortex are correlated with intelligence scores.
D) Neither the size, nor the degree of convolution of the cortex, are correlated with intelligence scores.

Answer: C
Rationale: The size of the cortex and increased convolutions (gyri) are associated with higher intelligence scores.