The correct answer is (c) C.B. Desi.
C.B. Desi was an Indian agricultural engineer who invented the Gobar Gas system in 1955. The Gobar Gas system is a method of converting animal dung into biogas, which can be used for cooking, lighting, and heating. The system is simple and inexpensive to operate, and it has been widely adopted in rural areas of India.
C.V. Raman was a physicist who won the Nobel Prize in Physics in 1930 for his discovery of the Raman effect. J.C. Bose was a physicist and biologist who is considered to be the father of modern Indian science. H. Khorana was a biochemist who won the Nobel Prize in Physiology or Medicine in 1968 for his work on the genetic code.