Which is the best example of dramatic irony?

A. The audience sees the killer hiding behind the door, but the character is unaware until it is too late.
B. A woman sarcastically tells her boyfriend that he looks very classy in a stained T-shirt and ripped jeans.
C. An old man believes that buying a lottery ticket every day will eventually make him very wealthy.
D. The audience is surprised to learn that the protagonist of the story has been lying the entire time.

Question

Which is the best example of dramatic irony?

 		A.	The audience sees the killer hiding behind the door, but the character is unaware until it is too late.
 		B.	A woman sarcastically tells her boyfriend that he looks very classy in a stained T-shirt and ripped jeans.
 		C.	An old man believes that buying a lottery ticket every day will eventually make him very wealthy.
 		D.	The audience is surprised to learn that the protagonist of the story has been lying the entire time.