A girl Kelli and a boy John are prekindergartners. If the children are consistent with patterns of development identified by research, which of the following would be the most valid prediction?
a. Their verbal abilities will be about equal.
b. Kelli's verbal ability will be superior to John's.
c. John's verbal ability will be superior to Kelli's.
d. No prediction of verbal ability differences can be made as early as prekindergarten.