Read then choose the best answer to complete the passage

In many countries nowadays, electricity, gas and water are necessities, companies which produce household goods realize that consumers want products that will not only work effectively, (36)_____________save money. In North America, household lighting accounts for 10% to 15% of the electricity bill. However, this amount can be (37)___________by replacing an ordinary 100-watt light bulb with an energy-saving bulb. Consumers can save 21 per bulb.  In Europe, there is a labeling scheme for refrigerators, freezers and washing machines, the labels tell the consumers (38)_________ energy efficiency each model has. (39)___________ with other appliances in the same category. The final result is  that these innovations will save money as well as conserve the Earth’s (40)___________.

In many countries nowadays, electricity, gas and water are necessities, companies which produce household goods realize that consumers want products that will not only work effectively, (36)_____________save money.