An electric heating coil rated at 1Kw is used to heat 2kg of water for 2 minutes. The initial water temperature is 30${}^o$C. Taking the specific heat of the water as 4,000Jkg ${}^{-1}$ and neglecting that of the container, the final water temperature is

A. 15.0${}^o$C
B. 45.0${}^o$C  
C. 52.5${}^o$C
D. 60.0${}^o$C

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Correct Answer: B