Stage set: justin's house. he is sitting on a chair in his porch. shawna enters.
justin: oh hey. i was just about to call you.
shawna: yeah?
justin: umm yeah. listen, you again for me with the assignment last night.
shawna: well, i do what i can.
justin: if there is anything i can do for you, let me know. i am not smart like you, but i do have other talents.
shawna: where are you headed?
justin: oh, i have to meet my guidance counselor. she will take me to a career seminar. which reminds me, i am running late.
i will catch you later.
shawna: hey! (notices he is wearing a suit-jacket and gym shorts) hey, justin!
justin: bye! (leaves the house and gets on his car) i will call you later! (waving and then rolling up the windows)
which of these is true about this play?

a. the audience's knowledge creates sarcasm.
b. justin uses irony when he says he has talents.
c. shawna is not really as smart as justin thinks.
d. the author uses dramatic irony to create humor.