Um.........wat?
Have a good night!
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.
1. March 31, 1732
2. May 31, 1809
3. Baron Carl Josef Fürnberg
4. Reutter's family
5. 1740
6. His brother Michael
I don't know the rest, sorry!
Proportion, movement, rhythm