According to one of the fundamental rules of the Constitution, who holds the ultimate authority in the United States?

The people, so it's C.

Explanation:

The Constitution was created to ensure that citizens who voted had the power and influence to change the government.

C. The people.

Explanation:

The constitution says the government was funder by and for the people. So the people would be the standing authority. Furthermore the checks and balances system is in place to maintain the power of the people.

answer; ///attempts to change more than once behavior at the same time;