Which of the following is the best example of situational irony?

a. a television show that stars male and female business partners.
b. your friend gives a confusing explanation for why he did something and you respond, "that's obvious."
c. a cowboy movie set at a rodeo, and the person who rides the bucking bronco the longest is an 8-year-old girl in a pink tutu.
d. a movie in which a man is rude to an older female stranger on the street. you know that woman is, in fact, his mother, although he does not.