What was the difference between the ironclads, the monitor, and the merrimac?

a)-the merrimac included a revolving gun turret.
b)-the monitor included a revolving gun turret.
c)-they were the same, designed and built by the same company.
d)-the monitor included multiple stations along both sides for rapid fire exchanges.

its c

Explanation:

i do not know if this question has options, but a main impact of the federal reserve act of 1913, which created the federal reserve bank, was the international use of the u.s. dollar, which soon became the world's leading currency - particularly during world war i, since many nations around the world asked the united states for money.