Passage Summary: For superconductors to be worth the money, they need to work at temperatures warmer than -148 degrees. The only candidate for this is a specific metal mix, but that mix stops working at -160 degrees, which is even colder.

Reasoning: Economic feasibility for superconductors requires a substance that works above -148 degrees Celsius, but the only candidate for this, a niobium-germanium alloy, only works up to -160 degrees Celsius.

Analysis: Treat the premises as absolute facts and look for a logical deduction. Since the only possible candidate for economic feasibility (the alloy) fails to reach the required temperature threshold (-160 is colder than -148), it follows that economic feasibility cannot be reached. You should look for an answer that concludes superconductors will not be economically feasible based on these temperature constraints.