The answer to your question is B. separation of powers
:D
Well besides the fact that if one didnt do its job, none of them could, they all needed the things that the others made or would do.
When President Roosevelt said on December 7, 1941 that the date would live in infamy he meant that the day would be remembered as a dishonorable and disgraceful day in American history do to the large loss of life from the Pearl Harbor attacks. Therefore, out of these words Roosevelt was equating the attacks to being done in manner that could be equated with "dishonor."