In its earliest days,psychology was defined as the

A) science of mental life.
B) study of conscious and unconscious activity.
C) science of observable behavior.
D) science of behavior and mental processes.

Mental Life

The internal workings of the mind, including thoughts, feelings, memories, and perceptions that constitute an individual's conscious and unconscious experience.

Conscious Activity

Actions or tasks performed while one is aware of their surroundings, thoughts, and feelings.

Observable Behavior

Actions or reactions of an organism, typically in response to external stimuli, that can be seen and measured directly.