The correct option is
C Destruction of chlorophyll
Sulphur dioxide inhibits photosynthesis by disrupting the mechanism. Sulphur dioxide hinders biochemical response of the plant. Sulfur dioxide causes changes in the colours of leaf tissue which result in white, yellow or brown patches. The exposure of these pollutants to the leaves cause a reduction in the concentration of their photosynthetic pigments viz., chlorophyll and carotenoids.
Hence, the correct answer is 'Destruction of chlorophyll'.