Which of the following upset the united states and moved it closer to entering the ww1?

The sinking of the Lustania? I think that was the name of the cruise ship, and was a rallying cry for the US into ww1, as Americans died in the transit. 

Germany’s resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson’s decision to lead the United States into World War I. Following the sinking of an unarmed French boat, the Sussex, in the English Channel in March 1916, Wilson threatened to sever diplomatic relations with Germany unless the German Government refrained from attacking all passenger ships and allowed the crews of enemy merchant vessels to abandon their ships prior to any attack. On May 4, 1916, the German Government accepted these terms and conditions in what came to be known as the “Sussex pledge.”

The answer is crop yield.