c) A straight line

In 1927, Philo Farnsworth transmitted the first electronic television image, which was a straight line. This achievement was a key milestone in the development of television technology. Farnsworth’s invention of the image dissector, a type of video camera tube, was crucial in the evolution of electronic television. His work laid the groundwork for the modern television industry, transforming media and entertainment and profoundly impacting communication and information dissemination in the 20th century.