What Is the Primary Goal of a Research Psychologist

What is the primary goal of a research psychologist?

A) To study how people mature and change physically,mentally,and socially throughout their lifetime
B) To study behaviors by examining physiological processes,especially those in the brain
C) To conduct experimental research on the basic psychological processes,such as learning,motivation,sensation,and a multitude of others
D) To acquire psychological knowledge through scientific methods and to teach this knowledge to students