How are visual aids used most effectively in a speech

C. To support a speaker's point by providing evidence or clarity.

Explanation:

Visual aids, such as photographs, videos, diagrams, graphs, charts, etc. have the ability to enhance a speech by providing evidence or clarifying a specific point or showing data in a way that is easily comprehendable and/or comparable (i.e. a line graph comparing two sets of data, or a pie chart showing the composition of the data).

recent news about two years ago indicates that a polish forestry student by chance unearthed at a depth of about 40cm (16 inches), during digging in a damp polish forest he found a 13-page manuscript into a thermos flask.

greek jew marcel nadjari was a aischwitz slave who witnessed how the nazi's built big death chambers and crematoriums and told how he was forced to escort fellow jews to the gas chambers. he accounts on this manuscript how the nazi's disguised this chambers to look like showers. also, he describes this place as a process of extermination from the chambers to the trains arriving to take the bodies.

ankara s dndkslqnebd