Option 1 -> C.V. Raman was a Nobel laureate physicist famous for the Raman Effect, not primarily associated with atomic energy.
Option 2 -> Homi Jehangir Bhabha founded the Tata Institute of Fundamental Research and served as the first chairman of India's Atomic Energy Commission.
Option 3 -> Meghnad N. Saha was a renowned astrophysicist known for the Saha ionization equation, not atomic energy architecture.
Option 4 -> Vikram Sarabhai is recognized as the father of the Indian Space Program, not the atomic energy program.
Hence, Option 2: Homi Jehangir Bhabha -> He is universally acknowledged as the father and chief architect of India's nuclear/atomic energy program, having established its foundational institutions and vision in the 1940s-1960s -> correct