Eight-Month-Old Gabriel Reaches for One of His Mother's Long, Dangly

Eight-month-old Gabriel reaches for one of his mother's long, dangly earrings and gets quite upset when she won't let him grab it. Gabriel's behavior reflects which one of the following principles?

A) Children's behavior is often goal-directed.
B) As children get older, they begin to acquire personal interests.
C) Children tend to form external attributions about their failures.
D) Many children increasingly internalize other people's values.