The correct answer is D) the entry of the United States into World War I was justified, and the timing was accurate.
The author makes the point that if the United States was getting involved in World War I for the sake of making sure the world was safe for democratic ideas, the US would have entered the war almost as soon as it began. Instead, the author discusses how the sinking of the Lusitania and the Zimmerman telegram were events tha caused America to declare war. These events were justification enough to join the Allied powers in their fight against Germany and their allies.