what does prospero mean in this speech to ariel in the tempest ?

Let them be hunted soundly. At this hour
Lie at my mercy all mine enemies:
Shortly shall my labours end, and thou
Shalt have the air at freedom: for a little
Follow, and do me service.

a. my life is coming to an end, and i now realize how much of it was a lie
b. i should have forgiven my enemies, and i would have peace of mind
c. i will set you free once we finish our work against our enemies
d. you will speak at my funeral and only remember the good i had done