Answer: Example
Explanation: In this case, April used an example to support her presentation, an example of how the air conditioner functions by simply describing how it worked, i.e some of the functions of the air conditioner that served as an example. She did not use comparisons with something else, or analogy as a stylistic figure to illustrate how devices work during her presentation. She simply used the example of temperature control to support what she has to offer, which is very effective in selling such devices, because it is easy to portray their work by example, far easier than to say, to portray the work of computers.
