After Reading the Section on the Brief History of I/O

After reading the section on the brief history of I/O psychology, you are preparing an outline to lead the discussion at the next class meeting. Why would you make the point that I/O psychology has focused on both research and application?

A) Early pioneers in the field, as well as later contributors, used research to guide their applied solutions.
B) Hugo Munsterberg divided his first textbook equally between topics from both.
C) A theory must be tested and supported initially before it can be used as a practical application.
D) Walter Dill Scott argued for a graduate training model later name the scientist-practitioner model.