India is likely to achieve strong growth over the next decade and will overtake Japan in nominalGDP by 2028 to emerge as the World's third largest economy says a foreign brokerage report. Hence, 3 is the correct answer.
Falling dependency ratios, financial maturity and increasing incomes and affordability are the three key drivers for the country to stand among the large emerging economies.
India has already overtaken Brazil and Russia to emerge as the second largest BRIC economy after China: Bank of America Merrill Lynch report.