Let's review the substances mentioned in the question and their roles in the process of photosynthesis:
A. ATP (Adenosine Triphosphate) - While ATP is indeed an energy carrier within cells, it is not formed directly as a primary product of photosynthesis.
B. [tex]\(O_2\)[/tex] (Oxygen) - Oxygen is a byproduct of photosynthesis, released when water molecules are split, but it is not an energy carrier.
C. [tex]\(C_6H_{12}O_6\)[/tex] (Glucose) - Glucose is a primary product of photosynthesis. It is a carbohydrate that stores energy and can be used by the plant for growth, cellular respiration, and energy.
D. [tex]\(H_2O\)[/tex] (Water) - Water is a reactant in photosynthesis, not a product. During the light-dependent reactions of photosynthesis, water molecules are split to release oxygen.
Given this detailed analysis, the correct answer is:
C. [tex]\(C_6H_{12}O_6\)[/tex]