Research on the academic performance of elementary school children has found that

A) temperament is not related to academic performance.
B) children with an "easy" temperament don't do as well in school as other children.
C) students do better when their temperament is similar to that of the teacher.
D) temperament plays a role in how well children do in school.

Research has found that temperament plays a role in how well children do in school. Children with a positive temperament, such as being adaptable and attentive, tend to have better academic performance than those with negative temperaments, such as being impulsive and irritable. However, it is important to note that temperament is just one of many factors that can influence academic performance.