Which of the Following Configurations of Batteries Would Result in the Voltage

Multiple Choice

Which of the following configurations of batteries would result in the voltage potential of a battery being subtracted from the system?

A) A parallel setup where the positives are hooked together and the negatives are hooked together
B) A series setup where the positive of one battery is hooked to the negative of the next battery
C) A combination setup made up of multiple cells in series,connected in a parallel fashion to provide power to the system
D) A series setup where the positive of one battery is hooked to the positive of the next battery