The temperature of a room heated by a heater is \( 20^{\circ} \mathrm{C} \) when outside tempera...

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The temperature of a room heated by a heater is \( 20^{\circ} \mathrm{C} \) when outside temperature is \( -20^{\circ} \mathrm{C} \) and it is \( 10^{\circ} \mathrm{C} \) when the outside temperature is \( -40^{\circ} \mathrm{C} \). The temperature of the heater is :
(A) \( 80^{\circ} \mathrm{C} \)
(B) \( 100^{\circ} \mathrm{C} \)
(C) \( 40^{\circ} \mathrm{C} \)
(D) \( 60^{\circ} \mathrm{C} \)
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