Millions of homes are now using low-energy lighting, but millions more have still to make the switch, a fact that the government and the home lighting industry are eager to change. Although low-wattage bulbs cost more per bulb than normal bulbs, their advantages to the homeowner are enormous, and ttherefore everyone should use low-wattage bulbs. Information about which one of the following would be LEAST useful in evaluating the argument? ['the opinion of current users of low-wattage bulbs as to their effectiveness', 'the profits the home lighting industry expects to make from sales of low-wattage bulbs', 'the specific cost of a low-wattage bulb compared with that of a normal bulb', 'the actual cost of burning low-wattage bulbs compared to that of burning normal bulbs']