The correct answer is option 4 - 1, 3 and 4.

To understand why, let`s break down each option:

Option 1: National Thermal Power Corporation Ltd (NTPC) is a Maharatna Central Public Sector Enterprise, but Hindustan Fertilizers Corporation Ltd is not. Therefore, this option is incorrect.

Option 2: Hindustan Fertilizers Corporation Ltd is not a Maharatna Central Public Sector Enterprise, and Steel Authority of India Ltd is. Therefore, this option is also incorrect.

Option 3: National Thermal Power Corporation Ltd is a Maharatna Central Public Sector Enterprise, but Hindustan Fertilizers Corporation Ltd is not. Steel Authority of India Ltd, as mentioned earlier, is a Maharatna Central Public Sector Enterprise. Therefore, this option is incorrect.

Option 4: National Thermal Power Corporation Ltd is a Maharatna Central Public Sector Enterprise, Oil and Natural Gas Corporation Ltd is also a Maharatna Central Public Sector Enterprise, and Steel Authority of India Ltd is a Maharatna Central Public Sector Enterprise. This option includes all three correct options and is the correct answer.

Therefore, option 4 is the correct answer.