Psychology is the science of what?

• A. The study of humans' genetic evolution
• B. The science of planetary orbits
• C. The science of weather and climate
• D. The science of behavior and mental processes

Answer: (D)

Psychology is the study of how people behave and what they think, feel, and perceive. As a science, it uses evidence, experiments, observation, and measurement to understand those behaviors and mental processes. This means looking not only at actions people can be seen doing but also at internal experiences like thoughts, emotions, memories, and motivations, and how brain activity relates to them. The other areas describe fields outside psychology: evolution and genetics focus on how traits change over generations; astronomy studies planetary orbits; meteorology and climate science examine weather and climate patterns. So the science that brings together observable behavior with internal mental life is psychology.