You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: OFFICIAL STATE THINGS 
Clue: The scuppernong grape is its state fruit; one vine in the Outer Banks is more than 400 years old
north carolina

Category: THE CIVIL WAR 
Clue: A century before the U.S.S. Nautilus, the Confederacy had 2 of these new ships, the Pioneer  & the Hunley
submarines

Category: NONFICTION 
Clue: While in prison Eldridge Cleaver wrote this 1968 book on the problems confronting black Americans

"soul on ice"