[单选题]
The heat of fusion of ice is 80w/as2:scr rzo5u. zu2 kcal/kg.)975a arok a/r p*ywrn When 50 g of ice at $0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?
A. $0 \; ^{\circ}C$
B. $12.5 \; ^{\circ}C$
C. $17.5 \; ^{\circ}C$
D. $20 \; ^{\circ}C$
