Final answer:
Dr. Seward uses a phonograph for his diary in Dracula, but the nearest answer from the given choices is (c) a cassette recorder, even though it's incorrect historically. The correct choice from the options provided should be (b) a typewriter. Additionally, 'movies with sound' were not yet invented in the era Dracula was published.
Step-by-step explanation:
The technology that Dr. Seward uses to keep his diary in Dracula is a phonograph, which at that time was a very modern invention. However, in the list of options provided, the closest option to a phonograph would be a cassette recorder (c), though it is anachronistic because the cassette recorder did not exist in the era of Dracula's publication. Therefore, the answer would be (b) a typewriter, even though it is not the exact answer, it is the most feasible option given the choices and represents a technology of the era. Dr. Seward's choice of cutting-edge technology reflects the Victorian era's fascination with new inventions and the novel's theme of old versus new.
Addressing a relevant trivia question, movies with sound, known as 'talkies', had not yet been invented at the time of Dracula and therefore, option (B) from the list provided would be the technology that was not a successful invention of the era. High-powered sewing machines, frozen foods, and typewriters were all significant inventions of that time which found commercial success.