Which was a cause of poor trade relations between japan and other countries? a the japanese people did not buy many imported goods. b japanese industries copied and improved the designs of imported products. c the japanese government subsidized only japanese companies. d the japanese government exercise too much control over international trade.

I believe the answer is: D.  the Japanese government exercise too much control over international trade.

They have notoriously high tariff for foreign products that want to come and compete in their country.
They do this to protect local companies and forced the foreign products to increase its price in the nation that make it harder for them to compete.