A Brass Rod,75

A brass rod,75.0 cm long and having a cross-sectional area of 2.50 cm²,conducts heat from a large furnace at 375°C into a very large cold water bath at 10.0°C without losing any heat at the lateral surface of the rod.Steady state has been established,and the thermal conductivity of brass is .The rate at which the entropy of the system (furnace plus water) is changing is closest to

A) 2.05 × 10^-2 W/K.
B) 2.64 × 10^-2 W/K.
C) 3.54 × 10^-2 W/K.
D) 4.69 × 10^-2 W/K.
E) 6.74 × 10^-2 W/K.