Which of the following are the factors responsible for the increasing importance of Public Administration in modern times:
1. Emergence of welfare state
2. Scientific and technological advancements
3. Rapid increase in population
4. Economic planning
5. Nature of modern warfare
Select the correct option:

A. 1, 2 and 4

B. 1, 2 and 3

C. 1, 2, 3 and 4

D. 1, 2, 3, 4 and 5

Answer: Option D