9. British intelligence forces intercepted the Zimmermann telegram which generated support for the U.S. to enter World War I. What was the main idea of the telegram?

A. Russia and Serbia wanted to provide weapons to the German army in exchange for political prisoners.
B. Bulgaria planned to enter the war on the side of Germany but only if they were guaranteed money .
C. Germany encouraged Mexico to attack the U.S. in return for Texas, New Mexico, and Arizona.
D. Austria-Hungary threatened Canada into staying neutral in the war or they would be attacked from the north.