If cold fusion worked, it would provide almost limitless power from very inexpensive raw materials, materials far cheaper than coal or oil. But replacing all the traditional electric generators that use these fuels with cold-fusion power plants would result in a reduction of no more than 25 percent in the average residential electric bill. Each of the following, if true, would help to resolve the apparent discrepancy between the predictions above EXCEPT: ['Personnel costs for the distribution of power to consumers are unrelated to the type of raw materials an electric company uses.', 'Most electric companies would be willing to incorporate cold-fusion technology into their power plants.', 'Cold-fusion power plants would be more expensive to build and maintain than traditional electric generators are.', "Only a relatively small portion of any residential electric bill is determined by the electric company's expenses for fuel."]