"<span>b: communism is an extreme form of socialism and, in theory permits no private property" would be the best option from the list, since there are socialist countries that very much allow the ownership of private property. </span>
AD (anno Domini) and BC (before Christ) are used to label the years in the Julian and Gregorian calendars.
Three factors fueled American Imperialism.
Economic competition among industrial nations. Political and military competition, including the creation of a strong naval force. A belief in the racial and cultural superiority of people of Anglo-Saxon descent.