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.