16. Which of the following best describes the main idea of the text?
(A)The rise of international travel after the pandemic has made it impossible for historical cities to become world famous destinations.
(B)While tourism is the most important engine for global economic growth, it should be limited to cities with modern infrastructure.
(C)The most effective way to solve urban overcrowding is to increase tourist taxes and replace local shops with high-end souvenir stores.
(D)Overtourism creates challenges, but shifting from a focus on quantity to quality can help create a better future for both residents and visitors.