In India, hydroponics was 1st introduced at

Answer: Option B

In India, hydroponics was 1^st introduced at Kalimpong.
The first work on soilless culture in India was started in 1946 at the Government of Bengal's Experimental Farm at Kalimpong.
Hydroponics is a type of horticulture and a subset of hydroculture that involves growing plants, without soil, by using water-based mineral nutrient solutions in aqueous solvents.
In 1929, William Frederick Gericke of the University of California at Berkeley began publicly promoting that the principles of solution culture are used for agriculture and He first termed this cultivation method "aquiculture".