The Question is worded as so:
Which of the following describes the United States' commitment to World War II?
The United States remained in isolation until the last few months of the war.
Once it declared war on Japan, the United States focused soley on the Pacifica area.
After declaring war on Japan, the United States sent troops to Europe.
The United States would only commit to air and naval missions in Europe and Asia.
Answer:
After declaring war on Japan, the United States sent troops to Europe.