Please answer the following question: Read the following article and select the best answer. Article: Express delivery: How you can buy your groceries from a virtual supermarket Aug, 1st, 2011 Daily Mail A "virtual supermarket" consisting of posters of goods put on platform walls is set to be introduced at London Underground stations. Passengers "shop" by scanning QR--Quick Response--codes of the items they want to buy using their smart phones. These goods are later delivered to their home address. Supermarket giant Tesco successfully trialed the hi-tech store in a South Korean underground station and there are now plans to bring the concept to Britain. NYPD to Scan Facebook, Twitter for Trouble Aug, 11th, 2011 Forbes The New York Police Department announced it will form a new unit to search social media as part of its law enforcement efforts, responding to the criminals' growing use of these sites to plan and celebrate illegal activities. The NYPD unit created particularly to _ social media sites like Facebook, Twitter, and BlackBerry messenger for information on planned crimes and their criminals. Space Junk reaching "tipping point", report warns Sep 3rd, 2011 Toronto Sun The amount of debris orbiting the Earth has reached "a tipping point" for crashes, which would produce more debris that may be dangerous to astronauts and satellites, according to a US study. According to the US Space Surveillance Network, the number of orbital debris jumped from 9,949 in December 2006 to 16,094 in July 2011. Question: The third piece of news will be in the_section of the newspaper. - sports - opinion - science - business
A:
science