what is the definition of a common market?\nshared goods and services in multiple nations\na single currency…

Answer:

C. no barriers to trade from nation to nation

Brief Explanations:

A common market is an economic - integration level where there are no trade barriers (tariffs, quotas etc.) among member nations for goods and services, and also allows for free movement of factors of production like labor and capital. The other options do not fully or accurately define a common market. Option A only mentions shared goods and services, option B refers to a single - currency which is not a defining characteristic of a common market, and option D is too general about competition and does not capture the essence of trade and factor - movement aspects of a common market.