$(2$i$).(2$p$)$ The roof of an electrically heated house is $7$ m long, $10$ m wide, and $0\mathrm{.}25$ m thick. It is

made of a flat layer of concrete whose thermal conductivity is $0\mathrm{.}92\frac{W}{m}*C.$ During a certain

winter night, the temperatures of the inner and outer surfaces of the roof were measured to be

$15C$ and $4C,$ respectively. The average rate of heat loss through the roof that night was

$($A$)41$ W

$($B$)177$ W

$($C$)4894$ W

$($D$)5567$ W

$($E$)2834$ W