The correct answer among all the other choice is C. Okinawa. This battle convinced Allied leaders that an invasion of the Japanese mainland might be too costly in human lives. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
Answer:
- Germany invaded Belgium, Britain had a treaty with Belgium if any country invaded anyone of them they had to defend the other country
- Called the Nexis Treaty pretty sure
Explanation: