Final answer:
London is considered a world city due to its global influence in finance, culture, and tourism. It has iconic landmarks, cultural institutions, and hosts major events.
Step-by-step explanation:
The city that is best considered a world city is London. London is often referred to as a world city because of its global influence in various aspects such as finance, culture, and tourism. It is one of the most important financial centers in the world, with a diverse population and a rich history.
London boasts numerous iconic landmarks like Big Ben, the Tower of London, and Buckingham Palace. It is also home to renowned cultural institutions like the British Museum, the National Gallery, and the West End Theatre.
Furthermore, London hosts major international events like the Olympic Games in 2012 and has a well-connected transportation system, including Heathrow Airport which is one of the busiest airports in the world.