What does scourge mean as it is used in the following lines from Act V, Scene 3 of Romeo and Juliet?

Prince: This letter doth make good the friar's words, Their course of love, the tidings of her death: And here he writes that he did buy a poison Of a poor 'pothecary, and therewithal Came to this vault to die, and lie with Juliet.--Where be these enemies? --Capulet,--Montague,-- See what a scourge is laid upon your hate, That Heaven finds means to kill your joys with love!
A. inconvenience
B. power
C. punishment
D. result

C. punishment