<span>The correct answer is c. crenellation. The Colosseum has all three Greek orders (Doric, Ionic, and Corinthian) in its columns, it has many arches (think semicircular openings), and it has a post-and-lintel system (in which vertical elements -- like columns -- hold up horizontal elements, with large spaces between these two elements -- like arches). However, the Colosseum does not have crenellation, which is a battlement often seen on castles. A crenellation is a low protective wall on the roof of a building, with repetitive, squared openings from which people could shoot intruders. </span>
The answer is (d.) choose only the visuals that are easily understood.
The main purpose of the visual aids is to help improve the understanding of the audience to the presentation. It clarifies and reinforce the key points of the topic. So it's important to choose the appropriate visual that could help the presentation easily understood.
