Final answer:
The method used by structural psychologists to report conscious experiences is called introspection. It is integral to structuralism, an approach founded by Wilhelm Wundt, focusing on examining one's own conscious thoughts and feelings.
Step-by-step explanation:
The method used by structural psychologists in which participants reported the contents of their conscious experience is b) Introspection. Structuralism is associated with Wilhelm Wundt, who is considered the father of experimental psychology. He utilized introspection, a process where individuals examine their own conscious experiences as objectively as possible. This approach aimed to break down conscious experiences into their component parts. Introspection contrasts with approaches such as behaviorism, founded by researchers like John B. Watson and B.F. Skinner, who focused on observable behavior rather than internal mental states, and psychoanalysis, established by Sigmund Freud, which delves into the unconscious mind.