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The answer would be A.
Radio and Television
Radio news made its appearance in the 1920s. The National Broadcasting Company (NBC) and the Columbia Broadcasting System (CBS) began running sponsored news programs and radio dramas. Not just something to be enjoyed by those in the city, the proliferation of the radio brought communications to rural America as well. News and entertainment programs were also targeted to rural communities.
Television combined the best attributes of radio and pictures and changed media forever. As on the radio, quiz shows and games initially dominated the television airwaves. But when Edward R. Murrow made the move to television in 1951 with his news show See It Now, television journalism gained its foothold. As television programming expanded, more channels were added.
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Answer:
The rock cycle is a concept used to explain how the three basic rock types are related and how Earth processes, over geologic time, change a rock from one type into another. Plate tectonic activity, along with weathering and erosional processes, are responsible for the continued recycling of rocks.
HOPE THIS HELPS!
The answer to the first question is most likely A. It makes the most sense to me. Though, I apologize if I'm incorrect. ^_^
