Question

what is the main product or purpose of photosynthesis?
to make carbon dioxide (co₂)
to make oxygen (o₂)
to make sugar (glucose)

Explanation:

Photosynthesis is a process by which plants use sunlight, carbon dioxide ($CO_2$), and water ($H_2O$) to produce glucose (a type of sugar) and oxygen ($O_2$). While oxygen is a by - product, the main purpose is to synthesize glucose which serves as an energy source for the plant. Carbon dioxide is a reactant in photosynthesis, not a product.

Answer:

To make SUGAR (glucose)