Answer:
The correct answer is: D. Sigmund Freud.
Explanation:
A dual processing theory, in theory, seeks to prove or provide explanations about how the process of thought can occur in different paths or ways.
Often the theorists of Dual processing state that thoughts can happen consciously and unconsciously, which means that there are thought processes that are controlled and voluntary, and thought processes that are implicit and automatic.
Sigmund Freud described that human beings had different levels of thought process: the conscious, preconscious, and unconscious.
In conclusion, it is easy to see why research into dual processing may provide evidence for levels of consciousness similar to the levels first described by Sigmund Freud.