(A) Bulgaria
(B) Austria-Hungary
(C) France
(D) ** Germany
EXPLANATIONS BELOW
Concept note-1: -In January 1917, British cryptographers deciphered a telegram from German Foreign Minister Arthur Zimmermann to the German Minister to Mexico, Heinrich von Eckhardt, offering United States territory to Mexico in return for joining the German cause.
Concept note-2: -Months earlier, British intelligence had intercepted a secret message from German Foreign Minister Arthur Zimmermann to the Mexican government, inviting an alliance (along with Japan) that would recover the southwestern states Mexico lost to the U.S. during the Mexican War of 1846-47.
Concept note-3: -The telegram said that if Germany went to war with the United States, Germany promised to help Mexico recover the territory it had lost during the 1840s, including Texas, New Mexico, California, and Arizona.
Concept note-4: -Germany promised to help Mexico take back land the United States had taken from Mexico in the Mexican–American War. These places were Texas, New Mexico, and Arizona. Germany wanted Mexico to enter the war so America would be too busy to help the enemies of Germany.
Concept note-5: -The “Zimmerman Telegram” promised the Mexican Government that Germany would help Mexico recover the territory it had ceded to the United States following the Mexican-American War. In return for this assistance, the Germans asked for Mexican support in the war.