Correct option is A
The correct option is: (a) Rising per capita income
Economic development refers to sustained improvement in living standards and wealth of a nation.
An increase in per capita income (income per person) is a direct indicator of economic progress and better resource distribution.
Other Indicators: HDI (Human Development Index), poverty reduction, literacy rate, employment rate.
Rising per capita income: Reflects increased productivity, investment, and economic growth.
Decreasing exports: Signals economic slowdown.
Reduction in industrialisation: Negative trend; development requires more industrial output.
Increasing population: Not an indicator unless matched with proportional economic growth.