Which important change did the rise in popularity of the radio broadcasting in the 1920s cause in US society? A) The Hollywood studio system lost its hold on entertainment as a new wave of radio stars became popular. B) Regional dialects largely disappeared as Americans began to emulate the voices they heard on the radio. C) The popularity of newspapers and magazines plummeted as Americans began to get all of their news from the radio. D) A new mass culture emerged, along with mass marketing techniques to influence the public.

the correct answer is a) egypt and china.

egypt and china are two of the world’s oldest civilizations known by man. both ancient empires have left a great historic and cultural legacy to the world through archeology. both civilzations developed complex social relations, had deep religious beliefs, had dominion of agriculture and left writing records to understand their customs and culture.

among the requirements to consider a civilization, we find urbanization, writing records, a place of residence, agriculture methods, technological specialization, means of transportation, currency, population density, social stratification, and political integration.

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.