B. Germany wanted to keep the United States out of the war while Great Britain wanted the United States to join it
Explanation:
At first, the United States adopted a neutrality policy towards the WWI, because in the US it was perceived mainly as a European war. Since the American interests leaned more towards the British side, because of their common industrial interests, than that of Germany, the latter wanted to keep the United States out of the war. Due to the great effort that Great Britain had to put in order to fight the military German power, GB wanted the US to join the war and help the Allies against the Central Powers. Finally, after the German navy attacked a civil British ship -<em>Lusitania</em>- that transported British and American citizens, the United States declared war against Germany.
