Question ID:PT53 S1 Q7 Passage:Superconductors are substances that conduct electricity without resistance at low temperatures. Their use, however, will never be economically feasible, unless there is a substance that superconducts at a temperature above minus 148 degrees Celsius. If there is such a substance, that substance must be an alloy of niobium and germanium. Unfortunately, such alloys superconduct at temperatures no higher than minus 160 degrees Celsius. Stem:If the statements above are true, which one of the following must also be true? Correct Answer Choice:AChoice A:The use of superconductors will never be economically feasible. Choice B:If the alloys of niobium and germanium do not superconduct at temperatures above minus 148 degrees Celsius, then there are other substances that will do so. Choice C:The use of superconductors could be economically feasible if there is a substance that superconducts at temperatures below minus 148 degrees Celsius. Choice D:Alloys of niobium and germanium do not superconduct at temperatures below minus 160 degrees Celsius. Choice E:No use of alloys of niobium and germanium will ever be economically feasible.