The correct answer is A. Costa Rica, EI Salvador, Guatemala, Honduras, Nicaragua.
The Central American Common Market (CACM) is a trade bloc of five countries in Central America: Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. It was established in 1960 with the goal of promoting economic integration and development in the region. The CACM has been successful in reducing tariffs and other trade barriers between its member countries, and it has also promoted cooperation in areas such as agriculture, industry, and tourism.
Bogota is the capital of Colombia, and Washington DC is the capital of the United States. Neither of these cities is a member of the CACM.