Which of the following is an oxidation-reduction reaction? A) HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l)
B) NaI(aq) + AgNO3(aq) → AgI(s) + NaNO3(aq)
C) Pb(C2H3O2)2(aq) + 2 LiBr(aq) → PbBr2(s) + 2 LiC2H3O2(aq)
D) Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g)
E) All of the above are oxidation-reduction reactions.

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.