A 400-G Piece of Metal at 100°C Is Dropped into a 100-G

A 400-g piece of metal at 100°C is dropped into a 100-g aluminum cup containing 500 g of water at 15°C. The final temperature of the system is 40°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings? The specific heat of aluminum is 900 J/(kg∙K)

A) 1900 J/(kg∙K)
B) 2270 J/(kg∙K)
C) 3300 J/(kg∙K)
D) 3800 J/(kg∙K)
E) 4280 J/(kg∙K)