Answer:
The correct answer would be synthesis of food with the help of sunlight.
Photosynthesis is the process by which green plants or autotrophs make their food from carbon dioxide and water in presence of sunlight and chlorophyll.
It converts solar energy into chemical energy (food).
It takes place in chloroplast of the cells. Green plants, algae, and cyanobacteria (it contains chlorophyll not chloroplast) can perform photosynthesis.
Oxygen is released as the byproduct of the process.
The equation for photosynthesis is written in the figure attached below.
