What is phd flopper in zombies

PhD Flopper is a Perk-a-Cola Machine that appears in the Call of Duty: Black Ops Nazi Zombies maps Ascension, Call of the Dead, Shangri-La, Moon, and secretly on Die Rise and Mob of the Dead, as well as in Cell Block and Origins from the WunderFizz Machine.

c or d both can be the answer

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.