Answer my question 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.

It takes place at the state level, but federal officials from each branch of government have to approve it.

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.

i believe the correct answer is b.