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"For Summer Sport. . . ."Down to the beach again-into the water-out on the boats. And every party a [radio] party, with concerts and dance music coming in on the air."Off to the camps again-deep woods-canoes on the lake-roasted corn. And a campfire. With a [radio] to bring in music from cities a thousand miles away."Baseball again-and the scores broadcasted to your [radio] in the backwoods. Quiet days of rest, but not dull days. Rainy days indoors, but days of fun. Fun all day, every day. . . ."Advertisement for radios, published in 1923The development depicted in the excerpt had most in common with which of the following earlier developments?A. The passage of land reforms during the Civil WarB. The expansion of the telegraph system during the Gilded AgeC. The enactment of moral reform legislation during the Progressive EraD. The efforts to mobilize popular support for the First World

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