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The formation of water is a reversible change. Identify the chemical equation of the formation of water.
$H_{2} + 2 O_{2} \to 2 H_{2} O$
$2 H_{2} + O_{2} \to H_{2} O$
$H_{2} + O_{2} \to H_{2} O$
$2 H_{2} + O_{2} \to 2 H_{2} O$

A

2 H_{2} + O_{2} \to H_{2} O

B

H_{2} + O_{2} \to H_{2} O

C

H_{2} + 2 O_{2} \to 2 H_{2} O

D

2 H_{2} + O_{2} \to 2 H_{2} O

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