Which of the following equations is balanced correctly?
I. 2 Ag2O → 4 Ag + O2

II. Cu + H2O → CuO + H2

III. Zn + HCl → ZnCl2 + H2

IV. 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

A.
I, II, and III only
B.
I, II, and IV only
C.
I, II, III, and IV
D.
I and II only