The correct option is B Processing and distribution of natural gas.
GAIL (India) Limited is the largest state-owned natural gas processing and distribution company headquartered in New Delhi. GAIL has been conferred with the Maharatna status on February 1,2013 by the Government of India. Currently only seven Public Sector Enterprises (PSEs) enjoy this coveted status.
In 2009, the government established the Maharatna status which raises a company's investment ceiling from Rs.1000 crores to Rs.5000 Crores.
Lists of Maharatnas:
1. Coal India Limited
2. Indian Oil Corporation Limited
3. NTPC Limited
4. Steel Authority of India Limited (SAIL)
5. Bharat Heavy Electrical Limited
6. GAIL (India) Limited
7. Oil and Natural Gas Corporation (ONGC).