A Circular Window in the Wall of a Home Has $^{\circ}$

A circular window in the wall of a home has a diameter of 25 cm and is made of a single pane of glass 0.30 cm thick.Thermal conductivity for the glass is 0.63 W/mK.If 1.6 kJ is lost through the window in 12 s,and if inside the house the temperature is 20 $^{\circ}$ C,what is the outside temperature?

A) -12 $^{\circ}$ C
B) 18 $^{\circ}$ C
C) 10 $^{\circ}$ C
D) 17 $^{\circ}$ C
E) -17 $^{\circ}$ C