Regis, a 6-Year-Old, Can Correctly Name Objects, Catch a Ball

Multiple Choice

Regis, a 6-year-old, can correctly name objects, catch a ball and throw it, and write his ABCs in proper sequence. His younger brother Mark is much less speedy and skillful in all of these areas. What is the best explanation for Regis's superior performance?

A) Regis most likely eats healthier foods than Mark.
B) Regis's brain has experienced greater myelination than Mark's.
C) Regis's frontal cortex is less mature than Mark's.
D) Regis has fewer dendrites than Mark.