Correct option is D
The power dissipated is given by
P=V2/R
Where V is the voltage applied across the device
R is the resistance of the device
The given ratings of electrical appliances are:
1 kW,250 V electric heater
1 kW,250 V electric kettle
1 kW,250 V electric bulb
As all the appliances have same power rating and voltage rating, all have equal resistance.
