Answer:
Answers for all of these:
1. Say
2. Countries of Origin
3. Peace
Explanation:
Got them all right in edge2020 :)
I hope this helps you with the background.
The correct answer is:
A. The sinking of passenger liners.
The use of submarines during World War I resulted in the sinking of passenger liners.

Santa cruz in 1791. Hope this helps! Let me know if you need more help!