Which years in India have been the best and the worst in terms of growth rate of national income ?

In India's post-independence economic history (up to the 2013 examination), 1979-80 was the worst year for national income growth, when real Net National Product (NNP) and GDP contracted sharply (by roughly 5.2% to 6.0%) due to a severe nationwide drought and the second global oil price shock. Conversely, 1988-89 recorded a historic peak growth rate in real national income (exceeding 10.2%–10.5%) driven by a strong agricultural rebound and industrial expansion. None of the other option pairs includes a severe negative-growth crisis year alongside a record double-digit growth year. Therefore, ('1988-89 and 1979-80') is correct.