The following factors would contribute to environmental pollution except?

A. production of ammonia
B. manufacture of cement
C. photosynthesis
D. combustion

Correct Answer: Option C

C. photosynthesis

Explanation

Photosynthesis is the process of food-making in plants, it doesn’t have any by-products that pose a threat to the environment. Infact, the plants use our waste product of respiration (Carbon dioxide) and uses it for the photosynthetic process and gives off oxygen as by-product.