Equal Masses of Ice at 0 $\degree$ C and Water at 100

Equal masses of ice at 0 $\degree$ C and water at 100 $\degree$ C are mixed in an insulated container.Estimate the final temperature of the mixture.

A) between 51 and 99 $\degree$ C
B) between 1 and 49 $\degree$ C
C) 50 $\degree$ C
D) 0 $\degree$ C
E) 100 $\degree$ C