Why is nomination by petition most widely found at the local level of government?

A. State law mandates that petition can only be used at the local level.
B. Getting enough signatures to be placed on the ballot is too easy in State and national elections.
C. Fewer signatures are needed on a petition in a smaller constituency.
D. Minority party candidates prefer petition process because it makes it easier for them to run for office.

C. Fewer signatures are needed on a petition in a smaller constituency

Explanation:

In order to force the government to conform to a certain petition, the petition need to require enough public support that might threaten the position of the government officials if they decided not to hear it.

Since the government official on local level represents smaller population than the federal level, Petition that given to local government has a much higher chance of success compared to petition given to state or federal government.