Correct Answer: (e) 1973
Note: During the second five-year plan, three new integrated steel plants were established with foreign collaboration. These were Rourkela (Odisha), Bhilai (Chhattisgarh) and Durgapur (West Bengal). These public sector undertakings were under the control of Hindustan Steel Limited. Steel Authority of India Limited was established in 1973 for the management of these plants.