A Windowpane Is Half a Centimeter Thick and Has an Area

A windowpane is half a centimeter thick and has an area of 1.0 m².The temperature difference between the inside and outside surfaces of the pane is 15 $\degree$ C.What is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 J/s*m* $\degree$ C. )

A) 50 000 J/s
B) 2 500 J/s
C) 1 300 J/s
D) 630 J/s