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