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