Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

All of these
Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
Is a better neutron moderator as well
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate

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Nuclear Power Engineering
Plutonium

Has much lower melting point (640°C ) compared to thorium (1690°C)
Is recovered from spent fuel from thermal nuclear reactor
Both A & B
Neither A nor B

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

None of these
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
Can't attain high temperature at normal pressure
Is not at all corrosive, even at a higher temperature

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