A 400-G Piece of Metal at 120°C Is Dropped into a Cup

Multiple Choice

A 400-g piece of metal at 120°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup?

A) 1470 J/(kg∙K)
B) 2830 J/(kg∙K)
C) 3420 J/(kg∙K)
D) 3780 J/(kg∙K)
E) 4280 J/(kg∙K)