Answer:
A - Photosynthesis is when a plant uses sunlight, Carbon Dioxide and water to make glucose and oxygen is you best option.
Explanation:
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The CO2 or carbon dioxide goes in through the stomata or holes in the leaf then goes in the cell, water enters through the roots, and the sun goes straight to the cell with the help of the chlorophyll in the cell. These are the reactants or the things that make the product. Then those reactants go through the cell and make glucose and oxygen.
If it weren't for plants photosynthesis we wouldn't have any oxygen.