Ten coulombs of positive charge flow from the +9 V positive terminal of a battery to the negative terminal at +3 V. What is the charge in potential energy of the charge? A) 90 J
B) 30 J
C) 60 J
D) -60 J
E) No solution

The correct answer should be b let me know if i’m wrong

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips.