Answer: Option (a) is the correct answer.
Step-by-step explanation:
Photosynthesis is defined as a chemical process in which plants tend to make their own food in the presence of sunlight, water and carbon dioxide.
During this process, product formed by the plants is glucose and oxygen.
The chemical reaction equation for photosynthesis is as follows.

Therefore, we can conclude that out of the given options the correct equation is as follows.
