An unknown metal of mass 192 g heated to a temperature of 100°C was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4°C. Calculate the specific heat of the unknown metal, if water temperature stabilises at 21.5°C. (Take, specific heat of brass is 394 J kg-1 K-1)

• A. 916 J kg-1 K-1
• B. 654 J kg-1 K-1
• C. 1232 J kg-1 K-1
• D. 458 J kg-1 K-1