When analyzing stages of economic development in the United States, it appears that we have entered the "tertiary stage." This is a stage marked by a shift toward: A) agriculture. B) manufacturing. C) services. D) population increases.

C) services.

Explanation:

This is easily explained to be the stepping in to a tertiary stage. As it is explained that economic development analysis stages consists of different phases and levels. This services that is been denoted in this growth in the US plays a key role in financial services, humanity, health and other visible relevant parts which help in the building and aiding of economic growth of a country's economy.

Information technology and educational services in a product offering. These services are seen to boost different parts of an economy especially in developing countries is mostly concentrated in financial services, hospitality, retail, health and human services.

answer; /// i believe the correct answer is (all of the above);