The U.S. fought the Battle of Iwo Jima so it could invade Japan itself. Hence, Option D is correct.
A major battle that was between the United States Marine Corps and the United States Navy occurred during the time period of February 19 through March 26, 1945. During World War II, the battle was to capture the island of Iwo Jima from the Imperial Japanese Army (IJA).
Iwo Jima is a small island. It is situated between Japan and the nearest US territory. As the battle was fought by the US, the reason behind this fight was to invade Japan itself.
Therefore, Option D: so it could invade Japan itself is correct.
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