Answer:
D. United States
Step-by-step explanation:
Iwo Jima was one of the last objectives in the US tactic of island-hopping in the pacific in the war against Japan. It was one of the bloodiest wars but most of the casualties came from Japanese civilians and soldiers as the troops couldn't tell which was which and some where misclassified before the fire-fight. Japanese soldiers also did not surrender and fought until all their soldiers were dead or wounded.