In the Aftermath of the Sinking of the British Passenger

In the aftermath of the sinking of the British passenger liner Lusitania,

A) Great Britain began an intensive campaign to build a submarine fleet.
B) Germany pledged to the United States it would not repeat such an action.
C) President Wilson prohibited Americans from traveling to Europe.
D) the United States declared war on Germany.
E) the United States began leasing its submarines to Great Britain.