Question

what is the primary source of energy for photosynthesis?
sunlight
heat
oxygen

Explanation:

Photosynthesis is a process in plants (and some other organisms) where light energy is converted into chemical energy. The primary source of energy for this process is sunlight, as plants use chlorophyll to capture light energy from the sun to convert carbon dioxide and water into glucose and oxygen. Heat is not the primary energy source, and oxygen is a product of photosynthesis, not an energy source.

Answer:

A. sunlight