The correct option is C It contracts till the temperature of water above reaches 4∘C
If we take some water at 0C and start heating it,we find that in the temperature range 0∘C to 4∘C,it contracts instead of expanding.on heating it further above 4∘C,it expands. if water initially at a temperature above 4∘C is cooled it contracts till the temperature of water above reaches 4∘C.