How long should it be?
Please answer my question so I cold edit this.
Dramatic irony is when the reader knows something big that the characters don't. So if you have to choose mutiple choice look for the answer that demonstrates something that the reader knows but the character doesn't.
Answer:
It indicates that great actors bring the characters the playwright imagined to life.
Explanation:
This sentence in the interview is saying that the actor that will be hired needs to be able to take on any role that the playwright could possible imagine. This requirement is surely a feature of a good actor, but it also makes sense to hire an actor versatile enough to be able to avoid hiring multiple actors for roles with which the first is not comfortable.