A 31.5 g wafer of pure gold, initially at 69.5°C, is submerged into 63.9 g of water at 27.5°C in an insulated container. The specific heat capacity for gold is 0.128 cal/g°C. What will be the final temperature of the system when thermal equilibrium is reached?"

A) 48.5°C
B) 45.0°C
C) 50.7°C
D) 52.3°C