Ice starts forming on a lake with water at `0^(@)C`, when the atmospheric temperature is `-6^(@)C`. If the time taken for 1 cm of Ice to be formed is 5 hours, then time taken for thickness of ice to change from 1 cm to 2 cm is

Options

A. 20 Hr.
B. 10 Hr.
C. 15 Hr.
D. 25 Hr.

Answer

C