Options:
A.
B.
C.
D.
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Earlier discussion
2 older comments kept for context.
Oluwaseun Adeyemi
The furring of kettles or boilers is as a result of the decomposition of Ca(HCO3)2 into CaCO3, and this coats the inside of a kettle or boiler used in heating water containing dissolved Ca(HCO3)2.
John Kenny Ade
When hard water boiled, it produces an insoluble deposit called calcium trioxocarbonate iv which form scales in boiler and fur in kettle.
Therefore the answer is D.