Question

a gas that plants release during photosynthesis

Explanation:

Photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce glucose and release a gas. The chemical equation for photosynthesis is \(6CO_2 + 6H_2O \xrightarrow[\text{Chlorophyll}]{\text{Sunlight}} C_6H_{12}O_6 + 6O_2\). From this equation, we can see that plants take in carbon dioxide and release oxygen during photosynthesis. Sunlight is an energy source, not a gas released. Nitrogen is not directly involved in the main photosynthesis gas - release process. Carbon dioxide is taken in, not released.

Answer:

C. oxygen (assuming the options are labeled as A. sunlight, B. carbon dioxide, C. oxygen, D. nitrogen)