The reaction you are describing represents photosynthesis. In photosynthesis, plants use energy from sunlight to convert carbon dioxide and water into glucose (a carbohydrate) and oxygen. The overall process can be summarized by the equation:
\[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \]
Therefore, the correct response is photosynthesis.