The Indian Rare Earths Limited (IREL) is a major player in:

The correct answer is: a) Mineral Sand Mining.

IREL is a government-owned company that was established in 1967 to mine and process rare earths. Rare earths are a group of 17 elements that are essential for many high-tech industries, such as electronics, renewable energy, and defense. IREL is the only company in India that mines and processes rare earths.

The other options are incorrect because:

• b) Oil Exploration: IREL does not explore for oil.
• c) Iron Ore Extraction: IREL does not extract iron ore.
• d) Coal Mining: IREL does not mine coal.

I hope this helps! Let me know if you have any other questions.