Respuesta :
B. The United States was extremely staple to the Allies victory.
The correct answer is: the decision played a major role because the United States supplied thousands of men and supplies to aid in the Allied victory.
When the US joined the Allies, they sent around 10.000 men a day, and Germany couldn`t replace their losses. So Americans helped the British Empire, French and Portuguese forces defeat Germany and had a major role in the final offensive.