Jackie, Mark, Dave line up at a ticket window. In how many ways can they arrange themselves so that Dave is third in line from the window?	Choose the correct choice from the following answers:
A) a 24
B) b 12
C) c 9
D) d 6
E) e 2
E   Dave's position is fixed. Now we need to arrange all others around Dave.   There are 2x1= 2 ways to arrange 2 people.
<result>D</result>
Jackie, Mark, Dave line up at a ticket window. In how many ways can they arrange themselves so that Dave is third in line from the window?