Given the task definition and input, reply with output. You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

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
(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.
D