Some Properties of a Certain Glass Are Listed Here

Some properties of a certain glass are listed here:
Density 2300 kg/m³
Specific heat capacity 840 J/kg ∙ °C
Coefficient of 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 9.0 mm thick.The temperature at the inner surface of the glass is
And at the outer surface 4°C.How much heat is lost each hour through the window?

A) 3.1 × 10^{7 J}
B) 3.1 × 10^{4 J}
C) 8.6 × 10^{3 J}
D) 8.6 J
E) 3.1 × 10^{5 J}