Correct Option: C

As the economy develops, the share of the tertiary sector in the GDP increases. The tertiary sector of the economy consists of activities where people offer their knowledge and time to improve productivity like telecommunication, hospitality industry/tourism, mass media, healthcare/hospitals, information technology, banking, insurance investment management, accountancy, legal services, consulting, retail sales, real estate, education. As economy develops people develop more skills and knowledge which they offer as services.