When 5-Year-Old David Was an Infant, His Mother Believed That

When 5-year-old David was an infant, his mother believed that he had a difficult temperament. Based on research presented in the text, it is reasonable to expect that on tests of cognitive problem solving, David will perform

A) poorly compared to other 5-year-olds.
B) well above average for his age.
C) no differently than any average 5-year-old.
D) at a level consistent with his IQ.