Answer: B. Evolutionary psychology
Explanation: Evolutionary psychology is a branch of psychology which utilizes evolutionary perspective and theory of natural selection in the study of human behavior. It argues that of human's internal mechanism or psychological traits are adaptation and product of natural selection. Human thought, reasoning, behavior and intellectual are product of evolutionary biology.
Of all the subfield of psychology listed. Evolutionary psychology is a 'growth' area which is likely to appeal to passionate students and attract federal support and funding.