During the civil war, “copperheads” referred to
(a) supporters of the anaconda plan
(b) northern supporters of the confederacy
(c) radical republicans who supported the union
(d) police offi cers who broke up the draft riots
(e) coinage minted withengravings of the presidents

During the Civil War, "Copperheads" referred to B. NORTHERN SUPPORTERS OF THE CONFEDERACY.

The Copperheads were those vocal democrats located in the Northern United States of the Union who were opposed to the American Civil War. They wanted to have an immediate peace settlement with the confederates. 

The Republicans were the ones who called these antiwar democrats "copperheads"; likening them to the venomous snake. 

He sailed off course on his way back to greenland and ended up in north america