Which of the Following Was an Important Reason Why Structuralism

Which of the following was an important reason why structuralism ended as a dominant school of psychology?

A) Introspection was a highly subjective method of analyzing consciousness, and it was difficult for others to validate or evaluate the claims made about a subject's conscious experiences.
B) Psychoanalysis was a much better method than introspection for determining the conscious experiences of an individual.
C) Structuralists did not want to examine important psychological issues like sensation and perception.
D) Titchener died, and there were no other well-established structuralists to continue his work.