The correct answer is B) The United States was immediately prepared to send a large army to Europe.
The statement that is not true about American preparedness for World War I is " The United States was immediately prepared to send a large army to Europe."
The United States Army was not completely prepared before entering World War 1. Compared to other armies of the time, the US Army was not one of the best. European countries had armies with more experience due to the many conflicts they had been faced in the past.
That is why some actions needed to be taken such as President Woodrow Wilson signed into law the Selective Service Act on May 18, 1917, in order to recruit and prepare more soldiers to join the Army. This action made possible the enrollment of nearly 10 million Americans. American troops also received instruction from French and British military offices.