At a meeting of 5 Chiefs of Staff, the Chief of Naval Operations does not want to sit next to the Chief of the National Guard Bureau. How many ways can the Chiefs of Staff be seated around a circular table?	Choose the correct choice.
A) 9	B) 12	C) 15	D) 18	E) 21
5 people can be arranged around a table in 4! ways.   Consider the two chiefs who will not sit together as a single unit.   The number of ways to arrange 4 units around a table is 3!   We need to multiply this by 2 as the two people can be switched in each arrangement.   The total number of ways to arrange the chiefs is 4! - 2*3! = 2*3! = 12   The answer is 12.
<result>B</result>
At a meeting of 5 Chiefs of Staff, the Chief of Naval Operations does not want to sit next to the Chief of the National Guard Bureau. How many ways can the Chiefs of Staff be seated around a circular table?