Among the choice provided above the statement that explains why a German submarine sunk the Lusitania is because Germany practiced unrestricted submarine warfare. This history happened last May 7, 1995, it was a <span> the 32,000-ton ship was hit by an exploding torpedo on its starboard side. </span>
I believe the answer is: Germany practiced unrestricted submarine warfare.
In restricted werfare, all of the countries would agree that they would not attack the submarines that are not a part of the warships. (such as passenger ships). The Gerrmany choose to adopt unrestricted warfare and sunk one of England's passenger ship.
