The correct answer is D) she was arrested for protesting against the war.
The main reason that Emma Goldman was significant in the history of World War I was that she was arrested for protesting against the war.
Emma Goldman (1869-1940) was a Russian writer and anarchist. She played a key role in developing the philosophy of Anarchism in the United States. In the times of war, when most people supported the war effort, she was brave enough to stand up and expressed her unconformity and protested against the war.