Which of the following statements with respect to the early practice of OD is correct?
A. The practice of management dates back about 100 years.
B. The scientific study of OD as a field of inquiry dates back about 50 to 60 years.
C. By 1950, most organizations were using OD.
D. Survival was not an issue in most organizations before 1950.
E. Early managers were not concerned with managerial efficiency and effectiveness