Correct option is D
· (A) T.H. Morgan: Discovered the principles of sex-linked inheritance, which earned him a Nobel Prize.
· (B) Kornberg: Identified DNA polymerase, which is vital for DNA replication.
· (C) Nathan & Smith: Pioneered the discovery of restriction endonucleases, enabling genetic engineering.
· (D) Paul Berg: Known as the father of recombinant DNA technology.