Which of the following equations is balanced correctly?
A.
3 H2O → H2 + 3 O2

B.
2 C3H3 + O2 → 2 CO2 + H2O

C.
2 C2H2 + 5 O2 → 4 CO2 + 2 H2O

D.
Cl2 + 2 KBr → KCl + Br2