Which of the following statements describes unrestricted submarine warfare?

A. Submarines were required to evacuate all passengers on ships before sinking them.
B. Submarines were used to sink ships with no warning and no opportunity to evacuate those on board the ship.
C. Submarines were used to ram ships when they surfaced.
D. Ships were allowed to ram submarines if they entered the "war zone" in the North Sea.



Answer :

Final answer:

Unrestricted submarine warfare in World War I involved sinking ships without warning or evacuation.


Explanation:

Unrestricted submarine warfare during World War I involved submarines sinking ships with no warning and no opportunity to evacuate those on board, a tactic used by Germany to disrupt Allied supply lines. The use of submarines in this manner contributed to the United States' entry into the war, as it violated international maritime laws.


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