The answer is pluralism.
Completing the sentence:
The fact that the farmers have more influence over agricultural price-supports than do other groups is an example of pluralism.
Quick definition:
Pluralism is the holding of two or more offices or positions at the same time. Pluralism is not diversity alone, but the energetic engagement with diversity.
D. The subsidies given to small farmers to grow certain crops \
We have to exclude all the monarchies from this, even the constitutional monarchies. These are: United Kingdom, Denmark, Norway and Sweden.
This leaves us with c as the correct answer!
Ps. I can't answer the second question since you forgot the question