Answer:
B) Hilgard
Step-by-step explanation:
The concept of the "hidden observer" was first proposed by the psychologist Ernest Hilgard in the 1970s as a way to explain the phenomenon of dissociation, or the separation of different aspects of consciousness. He suggested that the "hidden observer" is a part of the mind that is aware of and can observe the activity of other parts of the mind, even when those parts are not aware of their own activity.