Option A: Acts both as an efficient coolant as well as a moderator
Option B: Can be heated to a higher temperature without pressurizing
Option C: Is less prone to radiation damage
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Be a good absorber of neutrons
Option B: Be capable of attaining high temperature, only when it is pressurised
Option C: Have high density, but low heat transfer co-efficient
Option D: Be free from radiation damage and non-corrosive
Correct Answer: Be free from radiation damage and non-corrosive ✔
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