They are a form of "budgeted capital" since the money is used for this has been set aside for this purpose
To reduce competition from foreign grain producers .
It makes them more independent. If they had a limitless amount of terms, they could just vote for whatever was suitable at that time and keep their political power. Since they won't be able to stay in the congress longer, then they can vote whatever they want because there's nothing that will affect whether or not they get elected again.
The central government. It possesses most of the decision making power and authority.
The answer to this is B, hope it helps.