问题：
[单选题]What benefits come from introducing the structure of the presentation during the opening?
AIt helps the audience stay tuned in and improves comprehension.
BThe audience can make a mental checklist so when they get bored they know when the end is near.
CIt allows you to gage how interested the audience will be in your presentation.
DIt helps you make sure you cover all your important points during the body of the presentation.
