All of the Following Have Been Found to Be Associated

All of the following have been found to be associated with high reactive children except

A) about 40% of children are low-reactive.
B) they tend to become unsociable and fearful when they are about 2 years old.
C) if they are minimally fearful, they are called uninhibited.
D) they show low levels of motor activity and irritability when they are 4 months old.