Cities are not only the political, economic, cultural, technological and educational centers of a country or region, but they have also become powerful engines of economic growth. The three urban agglomerations of New York, Chicago and Los Angeles in the United States, and the three major cities of Tokyo, Hanshin and Nagoya The three major urban agglomerations, including the Yangtze River Delta, the Pearl River Delta, and the Bohai Rim, have contributed more than half of the country's economy. What is the most appropriate sentence to inherit the above text? ['It can be said that the economic development of a country mainly depends on the economic development of urban agglomerations.', 'It can be said that any country or region should focus on the development of big cities.', 'It can be said that the rise and fall of the city is related to the rise and fall of the country, and the development of the city is related to the development of the country.', 'It can be said that the development of the city cannot be separated from the support of the state, and the development of the country cannot be separated from the support of the city.']