The correct option is C 13.78%
Population in the previous year = 50,80,000
Present population = 51,50,000
Increase in population = 51,50,000 - 50,80,000
= 70,000
Percentage increase = Change in valueOriginal value×100
=70,00050,80,000×100
=13.78
Hence, the increase in population is 13.78%.