Which Statement Best Describes Hitler's Orders to His Submarine Commanders

Which statement best describes Hitler's orders to his submarine commanders in the Atlantic?

A) He ordered them not to fire on American vessels to avoid drawing the United States into the war.
B) He ordered them not to fire on American vessels because the Germans were temporarily low on ammunition.
C) He ordered them to fire on American vessels because he wanted to draw the United States into the war.
D) He ordered them not to fire on American vessels because he knew the Americans were committed to neutrality.
E) He ordered them to fire on American vessels because they were helping the British.