Alejandro Is Developing a Preliminary Research Study to Address the Question

Alejandro is developing a preliminary research study to address the question of whether 4-year-olds who are asked to delay gratification (e.g., to delay eating candy) perform differently in solitude than with other 4-year-olds. Which combination of research perspectives would be best for this preliminary study?

A) biological psychology and the individual differences approach
B) developmental psychology and social psychology
C) cognitive psychology and evolutionary psychology
D) evolutionary psychology and clinical psychology