The oxygen released during photosynthesis process comes from

Answer: Option A

During the process of photosynthesis, green plants and some other organisms use sunlight to convert carbon dioxide (CO₂) and water (H₂O) into glucose (a type of sugar) and oxygen (O₂). This process takes place in the chloroplasts of plant cells and is represented by the following chemical equation:

6 CO₂ + 6 H₂O + light energy → C₆H₁₂O₆ + 6 O₂

As you can see, the oxygen released during photosynthesis comes from the water molecule (H₂O). Carbon dioxide (CO₂) is used to produce glucose (C₆H₁₂O₆), which serves as an energy source for the plant. So, the correct answer is Option A: H₂O.