Answer: b) On Japanese forces in the Pacific.
Explanation: The United States has long held the stance of neutrality and isolation until the Japanese attack on Perl Harbour. The truth is that the attack on Perl Harbour was fatal, because the US did not expect an attack. There were diplomatic tensions between the US and Japan, but no one thought of the war in America. After this attack, the US entered the WWII and was mainly focused on the Japanese enterprises in the Pacific, and on gaining strategic advantage in the Pacific. Later, America, of course, joined the European Allies in the fighting in Europe.
