One of the Strongest Arguments in Support of a Genetic

One of the strongest arguments in support of a genetic or maturational basis for the development of motor skills is

A) their tendency to be displayed at predictable times and in similar ways in normal children.
B) the fact that children tend to engage in the same sporting and physical activities as their parents.
C) that siblings are no more similar in their motor achievements than are unrelated people.
D) physically disabled children do not attain the same motor milestones as normal children.