A 275 G Piece of Iron [C_P =25 $\degree$ C)] Is Heated to a Temperature of 57

A 275 g piece of iron [c_P =25.09 J/(mol . $\degree$ C) ] is heated to a temperature of 57.0 $\degree$ C and then placed in contact with a 225 g piece of copper at 20.0 $\degree$ C [c_p =25.46 J/(mol . $\degree$ C) ] in an insulated container.What is the final temperature of the two pieces of metal?

A) 38.5 $\degree$ C
B) 37.7 $\degree$ C
C) 41.4 $\degree$ C
D) 40.4 $\degree$ C
E) 43.8 $\degree$ C