Why is Wilhelm Wundt often credited as being responsible for the initial development of modern psychology?

A  He founded and was elected the first president of the American Psychological Association.

B  He promoted the idea that psychology could be studied scientifically and provided classes, textbooks, and a laboratory for training students.

C  He was the first to travel outside of his own country to “rally” other psychologists to the cause of working together to establish a new scientific discipline.

D  He was the first to suggest that there might be physical causes to psychological disorders, shifting the field away from its previous roots in demonology.