2.   The Eighteenth Amendment, "Prohibition," was reversed by the _______ Amendment. 

A. Twentieth
B. Twenty-first
C. Nineteenth
D. Twenty-second

B?

Correct.

butt cheeks

whoever said cheeks is so unfunny

Yes, you are correct. The Amendment that reversed the Eighteenth Amendment, also known as Prohibition, is the Twenty-first Amendment.

To find the answer, you could have approached this question by having some basic knowledge about U.S. constitutional amendments. If you weren't sure about the answer, you could have done a quick search to find a list of U.S. constitutional amendments and check which one repealed the Eighteenth Amendment.