Answer:
1. The topic
Do you have other options?
I had this same question but I had a fourth option
Explanation:
C frame format is the answer.
I think that is carbon dioxide gas
Notecards are normally used in a presentation when you're wanting to keep detailed facts and be prepared for what's coming up in your presentation, I'd say it's answer B If you make detailed notes on your notecard then you'll be prepared for what exactly you need to say.