Answer:
B. American public opinion was outraged against Germany
Step-by-step explanation:
The telegramm was made public, once any doubts as to regard the authenticity of the message were made.
Zimmermann hoped Americans would understand the idea was that Germany would only fund Mexico's war with the United States in the prior event of American entry into World War I. The call for war did not happen until more events unfolded. The public opinion however started to call for a war effort as more complications arose.
As later, the German submarines came to fully navigate in the waters of the Atlantic ocean, the public opinion enraged even more and called for action.
On 1 February 1917, Germany began unrestricted submarine warfare against all ships in the Atlantic bearing the American flag, both passenger and merchant ships. The two ships were sunk in February, and most American shipping companies held ships in that port. Besides the provocative war proposal to Mexico, the telegram also stated "ruthless employment of submarines". American public opinion demanded further action. Wilson had previously refused to assign US Navy crews and guns to the merchant ships. However, asthe Zimmermann note was made public, Wilson called for a war declaration but still senate blocked him his proposal.