My choice would be A. It’s not B since “the conflict are” is incorrect. Not C since “they writes” is incorrect. And I believe D is incorrect since “a Nobel Prize winner” doesn’t agree with “are” — you could rewrite it as “The Nobel prize winner IS either Lessing or Gordimer”.
Answer:
1. iaconic, wordy
2. help, impediment
3. disassociate, associate
4. low, lofty
5. baffle, enforce
6. license, prohibition