Which of the following make the Dominant Castes dominant?

These are the options for the question :Which of the following make the Dominant Castes dominant?

I. small population
II. land rights
III. intermediate caste
IV. decisive role in regional politics
a) I. and II.
b) I. and III.
c) II., III., IV.
d) I. and IV.

The correct answer is -c.