One of the reasons plants are important to us is because they reduce the amount of carbon dioxide in the atmosphere and increase the amount of oxygen, which we need to breathe. Explain how this statement relates to the chemical equation for photosynthesis.

Photosynthesis is a phenomenon in which green plants such as algae, fungus etc containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water present in the atmosphere  to form glucose which is used as plant food and oxygen which is liberated into the atmosphere for breathing.

The chemical equation for photosynthesis is:

where carbon dioxide and water are reactants and glucose and oxygen are products formed.

the answer your looking for is c).