Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.
In Western countries, electricity, gas, and water are not ___(1)___ but necessities. Companies now realize that consumers want ___(2)___ that will not only work effectively, ___(3)___ save money.
For most North American households, lighting ___(4)___ for 10 percent to 15 percent of the electricity ___(5)___. However, this amount can be ___(6)___ by replacing an ordinary 100-watt light bulb with an energy-saving bulb. These bulbs use a ___(7)___ of the electricity of standard bulbs and last eight times ___(8)___. Therefore, consumers can save about US$7 to US$21 per bulb. In Europe, there is a labeling scheme for refrigerators, freezers, washing machines and tumble dryers. The label tells the consumers how much energy efficiency each model has, compared ___(9)___ other appliances in the same category. Ultimately, these innovations will save money as well as ___(10)___ the Earth’s resources.