The central matter of “Blackmail” is _____.
A.
the Duke and the Duchess discussed with Ogilvie about running away
B.
the Duke and the Duchess negotiated with Ogilvie over how much they would pay for the dirty deal
C.
the Duke and the Duchess’ hatred toward Ogilvie
D.
the Duke and the Duchess quarreled over whether to accept Ogilvie’s blackmail