How are the reactants represented in the chemical equation for photosynthesis?

The photosynthesis equation is 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂. The reactants are the substances on the left side: carbon dioxide and water. Choice C, 6 CO₂ plus 6 H₂O, lists those reactants.

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