Which piece of textual evidence best supports the inference that the message Zimmermann sent was very important? Check all that apply.

The strongest evidence is that Zimmermann took special steps to make sure the message was delivered. He “wanted to be certain” it reached von Bernstorff, and he arranged for it to be carried aboard a U-boat. Those details show the message mattered enough to receive extra attention; the date and the fact that he sent a telegram do not show its importance as clearly.

AI-written and checked against the verified answer.