How does Fortunato advance the plot of “The Cask of Amontillado”?

Responses

A. He plasters a wall between himself and the outside world.
B. He eagerly follows Montresor into the crypt.
C. He leans on Montresor's arm as they walk.
D. He plans to join his wife at a party.

I think it's either B or C can you correct or confirm for me please?