Answer:
D. 6 CO 2 , 6 H 2O , and sunlight
Step-by-step explanation:
The reactant are the substances are going under a reaction. They are the "items" needed for a product to form. In which in this case, 6 CO 2 , 6 H 2O , and sunlight are needed to make C 6H 12O 6 + 6 O 2 .