I'm taking a test and have to guess the right answer to the question after the article. Article: Exploit your parking space An unused parking space or garage can make money. If you live near a city center or an airport, you could make anything up to PS200 or PS300 a week. Put an advertisement for free on Letpark or Atmyhousepark. Rent a room Spare room? Not only will a lodger earn you an income, but also, thanks to the government-backed "rent a room" program, you won't have to pay any tax on the first PS4500 you make per year. Try advertising your room on Roomspare or Roommateeasy. Make money during special events Don'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. Grashpadder can advertise your space. Live on set Renting 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 roof You need the right kind of roof, but some energy companies pay the cost of fixing solar equipment(aroundPS14,000) and let you use the energy produced for nothing. In return, they get paid for unused energy fed back into the National Grid. However, you have to sign a 25-year agreement with the supplier, which could prevent you from changing the roof. Question: If you want to use energy free, you have to _ . Options: A: sign an agreement with the government B: pay around PS14,000 for the equipment C: sell the roof to some energy companies D: keep the roof unchanged within 25 years
Answer:
D