Here's a problem to solve: Which statement is best supported by the chemical equation shown? 6CO_{2} + 12H_{2}O + light -> C_{6}H_{12}O_{6} + 6O_{2} + 6H_{2}O

Among the 4 following options, which is the correct answer?

- A: CO_{2} has 2 atoms of carbon in it.
 
- B: H_{2}O has 2 atoms of oxygen in it.
 
- C: Twelve molecules of H_{2}O are produced.
 
- D: Six molecules of CO_{2} are needed as reactants.
 