How did the white house justify firing everyone on the white house travel office staff?

The White House stated the firings were done because financial improprieties in the Travel Office operation during previous administrations had been revealed by an FBI investigation. Critics contended the firings were done to allow friends of President Bill Clinton and First Lady Hillary Rodham Clinton to take over the travel business and that the involvement of the FBI was unwarranted

Here are the options 
A. Clinton's only wanted friends and family working there.
B. The head of office is said to have embezzled money.
C. The department was no longer needed to handle business.
D. The people there were threats to national security. 

The Correct answer is B. The head of office is said to have embezzled money.