The agricultural revolution led to the need for organized
a. greenhouse gas reform.
b. pest control.
c. government.
d. technological reform.

I think that the best answer is C. government because it was the change that was the most immediate: agricultural revolution meant that not all people had to be employed in agriculture, and the society needed to organize themselves with the help of a government to provide jobs for those who didn't. Only years later were the other reforms necessary.

The answer is installation.