How many nationalised banks are there in India?

India had 20 nationalized banks following the major wave of bank nationalization in 1969 (14 banks) and 1980 (6 banks). This number remained stable for many years before the recent mergers that reduced the count. Option B (19) and C (18) are incorrect as they underestimate the historical count. Option D (21) is incorrect as it overestimates the number of banks that were actually nationalized.