Answer:
In the late fifties, a sociological phenomenon was suddenly remarked: a third of American women now worked,
Explanation:
11. Fragment 12. Sentence 13. Sentence 14. Fragment 15. Fragment 16. Fragment 17. Fragment 18. Sentence 19. Fragment 20. Fragment (sorry if i get any wrong youll still have a passing grade though)
If this is from "The Bet", then it would have been because the lawyer is writing this as a final notice before his escape.
I think it would either be A or C