Certain amount of heat is given to 100 g of copper to increase its

Certain amount of heat is given to 100 g of copper to increase its temperature by 21° 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 = 400 Jkg-1 K-1 and that for water = 4200 Jkg-1 K-1)
(a) 4° C
(b) 5.25° C
(c) 8° C
(d) 6° C

increase