List the ways in which Montresor ensures Fortunato's presence in the catacombs:
a) Offers him wine, Flatters him, Appeals to his pride
b) Lies about a rare wine, Claims to need his expertise, Plays on his curiosity
c) Uses force, Threatens him, Locks him in
d) Offers him riches, Persuades him with flattery, Coerces him with threats