I think it is (a) because most of the time they are telling a lesson
Answer:
A
Explanation:
I am assuming that this is what your teacher is looking for. I have been in theater for years and non of my duets were ever required to be published or 10 minuets long. If the answer isn't A, it is all of the above.
sorry i know that wasn't very specific, but i hope it was helpful
