According to Robert Dahl, the evolution of a science of public administration is a problem because of the need to concentrate on.
1. clarification of ends
2. aspects of human behaviour
3. integrated view of politics and administration
4. sociological study of administration
Select the correct option:

A. 1 and 2

B. 2 and 3

C. 3 and 4

D. 1 and 4

Answer: Option A