
Passage: Energy-saving lamps require less electricity and are more power-saving. Therefore, if people only use energy-saving lamps and do not use ordinary incandescent lamps that consume a lot of electricity, it will save a lot of electricity bills.
Question: Which of the following options is the hypothesis on which the above argument depends?
A. A.The brightness of energy-saving lamps is at least as bright as that of ordinary incandescent lamps.
B. B.People can reduce environmental pollution by using less electricity.
C. C.People always want to reduce electricity bills, water rate and so on.
D. D.Energy-saving lamps are no cheaper than ordinary incandescent lamps.
Answer: