Concept:A technopolis is a city or region built to support high-tech industries, research, and innovation.Explanation:Silicon Valley in the USA is a classic example of a technopolis. It hosts many IT and biotechnology companies, research labs, and startups. London, Paris, and Moscow are large capital cities with diverse economies, but they are not primarily designed as dedicated high-tech hubs. Technopolises focus on cutting-edge infrastructure, R&D institutions, and a collaborative environment for technology-driven growth. Among the options, only Silicon Valley fits this definition.Answer:Option A: Silicon Valley