Decreased rainfall in northern areas is due to
C
Deforestation in catchment areas
D
Deforestation in evaporating area near equator
Correct option is C. Deforestation in catchment areas
Deforestation leads to irregular water cycle, as a result there is decreased rainfall, deforestation in catchment areas is the main resaon behind the decreased reainfall in northern region.
So, the correct option is 'Deforestation in catchment areas'.