Concept:Bhilai Steel Plant is a major government-operated steel plant built during India's Second Five-Year Plan in collaboration with the Soviet Union. It is known for producing rails and structural steel.Explanation:The plant is located in the state of Chhattisgarh. It was established in the 1950s under the Second Five-Year Plan (1956–61). The first blast furnace was inaugurated by President Dr. Rajendra Prasad on 4 February 1959. Bhilai is India’s first and main producer of steel rails and also produces wide steel plates and other products.Answer:Option A – Chhattisgarh