Answer:
b. They exert less demand on electrical power plants
Explanation:
Energy star -certified products :
The products which uses less energy are known as energy certified products.These types of products are uses less energy.By using the energy star -certified products we can save energy.As we know that energy is limited that is why star rating become so important .
So the answer of the this question is b.
b. They exert less demand on electrical power plants
