Christopher Sholes invented the __ A sewing machine B typewriter c phonograph D radio

<p> Christopher Sholes, an American inventor and politician, is widely associated with the invention of the typewriter. While he was not the first to invent a writing machine, his improvements to existing prototypes were game-changing, ultimately resulting in the first practical and commercially successful typewriter. The choices for a sewing machine and a phonograph are related to other inventors; the sewing machine is largely credited to Elias Howe and Isaac Singer, and the phonograph to Thomas Edison. Similarly, the radio's invention links to figures like Guglielmo Marconi. Therefore, based on the historical validity and the role Sholes had in the development of the typewriter, the answer should be option B, typewriter.</p>