Which piece of textual evidence best supports the
inference that the message Zimmermann sent was very
important? Check all that apply.
"On January 16, 1917"
"a clear attempt to convince the Mexican
government to help Germany in the war"
"Arthur Zimmermann ... sent a telegram to Count
von Bernstorff"
"The foreign secretary wanted to be certain that this
message reached von Bernstorff
"he made arrangements for it to be carried aboard a
U-boat"