Which visual aid would most a speech about the history of air travel

C). A graph showing the increase in jet speeds over time.

Explanation:

Visual aid is described as the graphic or visual illustration of the information presented that assists the readers to understand and memorize the content more effectively. Visual-aid serves to compliment the information through pictorial or visual representation that accentuates the idea or information which helps the audience to affiliate the information and remember it more comprehensively and conveniently. It also functions to authorize the author's reliability by making the content more evident. Thus, option C is the correct answer for the given question as 'the graph'(visual representation) would supplement the information of 'increase in jet speeds over time'.

explanation:

the silver bells of the sleds are merry and keep time in the winter nights while the sky twinkles happily. the golden bells of weddings are delightful in their peaceful happiness, foretelling a rapturous future. meanwhile, the brazen alarm bells scream frightfully in the night, with a discordant and desperate sound. in their clamor, these bells convey terror, horror, and anger. finally, the iron bells are solemn and melancholy, while those in the church steeple are like ghouls who feel happiness. the king of the ghouls, who rings the bells, cheerfully keeps time with the moaning and groaning bells.