How is the "speaker" in an academic presentation similar to a "tour guide"?
选项：

A:Both of them need to tell people the "destinations" in advance to ensure that they feel safe to "follow".
B:Both of them use louder speakers to make sure that people can hear them.
C:Both of them need to be trained to acquire the necessary skills to be up to the positions.
D:Both of them use "maps" to make sure that they are going in the right direction.