Why did the United States and other countries enforce a ban on the export of iron, steel, and fuel to Japan in the 1930s?

Japan pursued an aggressive military policy at the time it invaded China.
Japan wanted to become the most influential voice at the League of Nations.
Japan already had a surplus of those resources, and it would have hurt its economy.
Japan was the first to initiate a trade war with other nations by raising tariffs on imports.
is it the last one?

Yes, A is the right answer.

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Thank you Ms. Sue <3

Well, the only other answer that I know is a true fact is the first one because during the depression Japan kept attacking China because they had no resources left.

No, not the last one.

Yes, the last option is correct. Japan was not the one being banned from exporting iron, steel, and fuel, but rather other countries, including the United States, enforced the ban on exporting these resources to Japan. This was in response to Japan's initiation of a trade war by raising tariffs on imports, which was seen as an aggressive move to protect its own industries and gain economic advantage. The ban on exporting these resources was a means for other countries to put pressure on Japan and limit its ability to pursue its aggressive military policies, such as the invasion of China.