What are the factors that have contributed towards the growth of the study of Public Administration in the U. S. A. as a separate academic discipline?
1. Evaluation of the concept of walfare state
2. Scientific management movement
3. Industrialisation
4. Movement for government reform
Select the corect answer:

A. 1 and 3

B. 2, 3 and 4

C. 1 and 4

D. 1, 2, 3 and 4

Answer: Option D