James Succeeded as a Teacher of Psychology in Large Part

James succeeded as a teacher of psychology in large part because:

A) he had the best equipped experimental psychology laboratory and could demonstrate the new scientific psychology in an exciting way.
B) he had an engaging teaching style and the ability to make the findings of psychology personally relevant to his students.
C) he was able to incorporate literary references from his brother's and other popular novelists' work into his lectures.
D) all of the above