Answer:
The correct answer would be option A, Martin Seligman. He is the one who believed that cognition was an important part of behavior.
Step-by-step explanation:
Martin Seligman is an American psychologist. He is also an author and has written many books, especially on self-help. Learned Helplessness was his theory which made a mark in history. He has promoted the positive psychology and the well being associated with it.
Martin was the psychologist who believed that cognition, which is the process of getting knowledge through thoughts, senses and experiences, was an important part of behavior.
People's behavior are usually govern by their learned knowledge or through their senses or experiences. For example, a person experiences that getting furious on small things don't help him out in situations, so his behavior of anger changes, which means that cognition served as an important part in governing the behavior or people.