The sinking of the RMS Lusitania is viewed as one of the factors that turned public sentiment in the United States away from remaining neutral. How could the sinking of a British ship have this effect?
 A.
 The United States and the United Kingdom had a military alliance that required them both to declare war if citizens of either were attacked.
 B.
 The ocean liner was en route from New York City and its sinking by a German submarine caused the deaths of 128 US civilian passengers.
 C.
 The German government unsuccessfully tried to blame the sinking on a US submarine in order to drive a wedge between the Allied Forces.
 D.
 The German government had previously followed the practice of issuing warnings when targeting shipping routes but did not do so in this case.