Concept:Electrical energy conservation means using appliances efficiently to reduce power consumption.
Explanation:I. Putting off electrical appliances when not in use saves energy directly.
Appliances left on continue to consume power unnecessarily.
Switching them off prevents this waste.
So, I is correct.
II. Ironing clothes one at a time wastes energy.
The iron heats up, cools down, and is reheated for each single item.
This repeated heating uses much more electricity.
So, II is not a conservation method.
III. Ironing clothes in bulk is an efficient practice.
The iron is heated only once for many items.
It uses the stored heat for a longer period, saving energy.
So, III is correct.
Answer:The correct combination is I and III only.
Option C.