Step 1: Understanding the Concept.
India's Green Revolution of the 1960s-70s dramatically raised food grain output through high-yield seed varieties and better farming methods.
Step 2: Check the options.
Dr. Verghese Kurien is known as the father of India's White Revolution (dairy/milk), not the Green Revolution, so option A is wrong. Dr. Amrita Patel succeeded Kurien at the National Dairy Development Board, also dairy-linked, so option B is wrong. Gurudev Khush is a respected rice geneticist but is not given this title, so option D is wrong.
Step 3: Final Answer.
M. S. Swaminathan led the introduction of high-yield wheat varieties in India and is called the father of India's Green Revolution, so option C is correct.