My best guess would be A. B is the second best answer. C and D don't seem to be very good answers. How many attempts do you have at this question?
Repetition
Because repetition means repeating and “over and over “ would be repeating
Well, using my limited knowledge, "cleaving" means to chop, break in half, split, etc. Twain means twice. So, perhaps it's like "you've broke my heart in half", something along those lines? hopefully this helps you.
The book's main theme is resistance to reductive binaries, whether it's good and bad, adult and child, or male and female. Hope this helps!!