Question

"carter delivered a presentation about the need to change your car's oil on schedule. in his speech, carter compared driving a car with dirty oil to walking a mile with small bits of gravel in your socks. this comparison illustrates a type of supporting material called a(n)"

Answer 1

This comparison illustrate a type of supporting material called AN ANALOGY.
An analogy refers to a comparison between two things, which was done for the purpose of explaining or clarifying the similarities and differences between the objects concerned.