If the United States wanted to make the most difference in tightening up energy efficiency of widespread energy-using devices, which one of the following is likely to attract the least attention?
a. internal combustion engines
b. nuclear power plants
c. refrigerators
d. incandescent light bulbs
e. heating and air conditioning systems
Answer: C
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.