The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

A Ice is bad conductor of heat.
B The density of water is maximum at 40C.
C Since the surface of the lake is at the same temperature as the air, no heat is lost.
D None of the statements (A), (B) and (C) given is correct.
Answer & Explanation
Option: [A]

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