The correct option is C Carbon dioxide
∙ Plants prepare their food by a process called photosynthesis.
∙ Plants require sunlight, carbon dioxide, and water to prepare their food.
∙ Roots supply water from the ground to all parts of the plant like stem, leaves, etc.
∙ On the underside of leaves, there are small openings called stomata. It is from here that carbon dioxide enters the plant.
∙ The leaves contain a green pigment called chlorophyll that absorbs the sunlight and prepares food for the plant using carbon dioxide and water.