Its past, "have experienced" meaning they've already been through it
At the end of Frankenstein, Victor and the monster both come to death. Victor dies on Captain Walton's ship while running from the monster. ... Then, Walton comes into the room where Victor's body is, and the monster is there, crying over him.
https://www.enotes.com/homework-help/end-what-happens-frankenstein-creature-differences-593510
A isn't correct because it would be Is
C would be were
so the correct answer is B Because Don't agrees with the subject
