An electric kettle with negligible heat capacity is rated at $2000W$, if $2.0kg$ of water is put in it, how long will take the temperature of water to rise from ${20}^{\circ }C$ to ${100}^{\circ }C$ ? [Specific heat capacity of water
$=4200Jk{g}^{-1}{K}^{-1}]$

A. $336s$  
B. $240s$
C. $168s$
D. $84s$

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Correct Answer: A