Answer:
A clock can be used to create suspense by saying for example "3 years later" and then shows what ahppens
Explanation:
If you're an auditory learner, it's best to learn by hearing things, so listen in class! :)
Some other techniques include recording yourself saying stuff that you need to know and playing it back and listening to that to learn it.
I would say A but mostly B only because if it wasn't important then why did the narrator kept talking about the fly?