Why did japan bomb pearl plz i need this answer asap

Japan wanted to 'destroy' America's navy in an un-expected and aggressive way, so they bombed Pearl Harbor, they un-intentionally killed many civilians. 

The U.S. and Japan had been butting heads for decades and it was inevitable that things would eventually culminate into a war. Japan had imperial ambitions to expand to China to solve some demographical and economical problems and to take over the Chinese import market. When in 1937 Japan decided to declare war on China, America was very against this aggression and responded with trade embargoes and economic sanctions. Specifically, the oil embargo that America organized with the British and the Dutch was a thorn in the side for Japan, which imported 90% of its oil. Without oil Japan’s military could not function and all war efforts would come to an end. Negotiations had been going on for months between Washington and Tokyo, without any resolution, so Japan decided to attack first.

Ithink it would be choice b (county). hope this you!