Answer : 3. "1 and 3 only"
Explanation :

Alluvial soils: Alluvial soils are widespread soils in India mostly in Northern Plains and River valleys. These soils cover 40% of the total area of the country. Hence statement a is correct These soils are depositional soils transported and deposited by rivers and streams. Alluvial soils are categorised as Khadar and Bangar based on deposition. Hence statement c is correct. Khadar - New alluvium, deposited by floods annually. Bangar- old alluvium, deposited away from flood plains. Both Khadar and Bangar contain Calcerous concentration (kankars). Khadar soil is more fertile than Bangar. Hence option d is correct. Alluvial soils are fertile soils. Their nature various from sandy, loam to clay. Hence statement b is correct. Alluvial soils contain an adequate amount of Potash, phosphoric acid and lime. Hence statement e is correct. These soils are intensively cultivated. They are suitable for the cultivation of Sugarcane, paddy, wheat and pulses. Hence statement f is correct. Alluvial soil colour varies from light grey to ash grey.