What personality trait correlates with altruism in young children?

In the 1954 decision, Brown v. Board of Education, the U.S. Supreme Court ruled that

A) high school students have the right to wear buttons with political messages in school. B) racially segregated schools are inherently unequal. C) student religious groups have the right to meet on school property. D) schools can ban the distribution to students of birth control information.

Dr. Walton is interested specifically in how the brain changes during the period of infancy and early childhood. As such, his interest falls most clearly into which of the following domains of human development?

a. the sociocultural domain b. the physical domain c. the cognitive domain d. the personality domain