Answer:
d. her brother
Explanation:
Evolutionary psychology is described as one of the branches in psychology which is generally focused on the process through which evolution is responsible for shaping the behavior and mind of an individual. It generally states that a person's brain consists of many "functional mechanisms" known as 'evolved cognitive mechanism' and 'psychological adaptations' that has been designed via 'natural selection'.
An evolutionary psychologist is considered as a person who follows an evolutionary perspective in his or her studies and practice.
The correct answer is option d.