Steel Authority of India Limited was incorporated in the year:

Correct option is D

The correct answer is (d) 1973 

Explanation:
• Steel Authority of India Limited (SAIL) is one of the largest state-owned steel-making companies in India.
• It was incorporated on January 24, 1973, following the recommendations of the Khanna Committee.
• SAIL functions as an integrated steel producer and is a public sector undertaking (PSU) under the Ministry of Steel. 

Information Booster:
• SAIL operates several major steel plants in India, including those in Bhilai, Bokaro, Rourkela, Durgapur, and Burnpur.
• It is a "Maharatna" company, a status granted to major PSUs in India with significant autonomy. 

Additional Knowledge:
(a) 1965: .
• While steel production was ongoing in India during this period, 1965 is not the incorporation year of SAIL. 

(b) 1963: .
• This year is incorrect for the incorporation of SAIL. 

(c) 1975: .
• This year is incorrect; 1973 is the precise year of incorporation.