[单选题]
A window glass 0.50-cm thick has dimensio y:m2+s.uj b4 7isnrhgnso 7i4yh t./itq of 3.0 m by 1.5 m. If the outside temperature isho .t7/it iqy4 $-10 \; ^{\circ}C$ and the inside temperature $20 \; ^{\circ}C$, what is the rate of heat conduction through the window?
A. $13 \; kW$
B. $20 \; kW$
C. $23 \; kW$
D. $30 \; kW$