Certain amount of heat is given to 100 g of copper to increase its temperature by \[21{}^\circ C\]. If the same amount of heat is given to 50 g of water, then the rise in its temperature is (Specific heat capacity of copper\[=400J k{{g}^{-1}} {{K}^{-1}}\] and that for water =\[4200 J k{{g}^{-1}} {{K}^{-1}}\])

• A. \[4{}^\circ C\]
• B. \[5.25{}^\circ C\]
• C. \[8{}^\circ C\]
• D. \[6{}^\circ C\]