Some Properties of Glass Are Listed Here

Some properties of glass are listed here.
Density: 2300 kg/m³
Specific heat: 840 J/kg·C°
Coefficient of linear thermal expansion: 8.5 × 10^-6 (C°) ^-1
Thermal conductivity: 0.80 W/(m·C°)
A glass window pane is 2.7 m high, 2.4 m wide, and 2.0 mm thick. The temperature at the inner surface of the glass is 22°C and at the outer surface 4.0°C. How much heat is lost each hour through the window under steady state conditions?

A) 1.7 × 10^{8 J}
B) 1.7 × 10^{5 J}
C) 4.7 × 10^{4 J}
D) 4.7 × 10^{1 J}
E) 1.7 × 10^{6 J}