45.Exploit your parking spaceAn unused parking space or garage can make money. If you live near a city center or an airport, you could make anything up to £200 or £300 a week. Put an advertisement（广告）for free on Letpark or Atmyhousepark.Rent（出租）a roomSpare room? Not only will a lodger（房客）earn you an income, but also, thanks to the government-backed “rent a room” program, 45you won’t have to pay any tax on the first £4500 you make per year. Try advertising your room on Roomspare or Roommateeasy.Make money during special eventsDon’t want a full-time lodger? Then rent on a short-term basis. If you live in the capital, renting a room out during the Olympics or other big events could bring in money. 46Grashpadder can advertise your space.Live on setRenting your home out as a “film set” could earn you hundreds of pounds a day, depending on the film production company and how long your home is needed. A quick search on the Internet will bring up dozens of online companies that allow you to register your home for free—but you will be charged if your home gets picked.Use your roofYou need the right kind of roof, but some energy companies pay the cost of fixing solar equipment (around £14,000), and let you use the energy produced for nothing. In return, they get paid for unused energy fed back into the National Grid. 47However, you have to sign a 25-year agreement with the supplier, which could prevent you from changing the roof.If you earn £5000 from renting a room in one year, the tax you need to pay will be based on ______.
(A) £800
(B) £500
(C) £4500
(D) £5000