The answer is B,
Japan struck Pearl Harbor to limit the U.S navy from taking action against them increasing their sphere of influence around Southeast Asia
it left fewer British troops to fight in North America.
I think it should be because diplomats is the representative of a nation and negotiating with other nations could be more easier if we're already friendly with the diplomat. Also the way we treat their diplomat is also the way of how we treat the nation he/she representing and it would add a good standing in the global status if we are respecting the diplomats.
