Dramatic irony is a literary device in which the audience knows something that the characters of the story or play are unaware of. This creates suspense and anticipation in the reader. In this case, the audience is aware of the fact that the antagonist is about to grab the protagonist. However, the characters in the story are unaware of this.
I believe it is A due to "The lady made detailed plans, engaged the caterer and the orchestra well in advance" isn't exactly connect well and be hard to understand so you'd put a comma between "caterer, and".
