I love them but they are scary to ride but that might just be me because I had an accident while riding
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.
Answer:
It makes this old man and his surroundings grey. This creates contrast.
