Which famous radio show was responsible for spreading country music across the country during the depression ? hooverville happy days grand ol’ opry swing time

I would say the answer is grand ol’ opry because it first opened in 1925. The Great Depression started in 1929 and ended in 1939. Happy Days first aired in 1974 passed the Great Depression. Swing time is a book and Hooverville was the town built during the Great Depression. So C. Is your answer, hope this helps :)
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