The top of a lake gets frozen at a place where the surrounding air is at a temperature of \( -20...

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The top of a lake gets frozen at a place where the surrounding air is at a temperature of \( -20^{\circ} \mathrm{C} \). Then :
(A) The temperature of the layer of water in contact with the
\( \mathrm{P} \) lower surface of the ice block will be at \( 0^{\circ} \mathrm{C} \) and that at the bottom of the lake will be \( 4^{\circ} \mathrm{C} \)
W
(B) The temperature of water below the lower surface of ice will be \( 4^{\circ} \mathrm{C} \) right up to the bottom of the lake
(C) The temperature of the water below the lower surface of ice will be \( 0^{\circ} \mathrm{C} \) right up to the bottom of the lake
(D) The temperature of the layer of water immediately in contact with the lower surface of ice will be \( -20^{\circ} \mathrm{C} \) and that of water at the bottom will be \( 0^{\circ} \mathrm{C} \)
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