The resistance of the filament of a lamp increases with the increase in temperature. A lamp rated `100 W` and `220 V` is connected across `220 V` power supply. If the voltage drops by `10%`, then the power of the lamp will be
A. 90 W
B. 81 W
C. Between 90 W and 100 W
D. Between 81 W and 90 W
