Answer:
I think it's because when you're laughing, you're happier because something made you smile while if you were just talking you wouldn't be as joyful.
Explanation:
Answer:
possibly just depending on the film or book
Your answer is B., because it is unidentifiable, so if they don't know the source, then why cite it right? :P :D So anyways, that's why your answer is B. =)
I hope I helped! =D
