Willie Is Giving a Speech on Stonehenge

Willie is giving a speech on Stonehenge. He carries around a model of part of Stonehenge, but one of the audience members looks at the model and tries to figure out what the mathematical symbol for pi that Willie is carrying has got to do with Stonehenge. What mistake did Willie make?

A) He did not explain his visual aid because he assumed the audience would recognize it as a model of the monument.
B) He confused the audience by creating an overly complex visual aid that was easy to misinterpret.
C) He did not pass the model around while he was discussing it.
D) He brought in a model that was boring and the audience did not notice it.