Why is the amendment process in the Constitution an example of federalism?

It takes place at the federal level with input from Americans willing to travel to the nation's capital.
It takes place at the state level, but federal officials from each branch of government have to approve it.
It specifies that each amendment must be ratified first by the states and then proposed by Congress.
It requires cooperation between the state and national governments to ratify an amendment.

The correct answer is:

It requires cooperation between the state and national governments to ratify an amendment.

The amendment process in the Constitution is an example of federalism because it involves both the state and national governments working together. Amendments must first be proposed by Congress, which is at the federal level. However, for an amendment to be ratified and become part of the Constitution, it must be approved by the state governments. This process showcases the cooperative relationship between the state and national governments, which is a key feature of federalism.