A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster. If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?
A. 0
B. 1/9
C. 2/9
D. 1/3
E. 1
A. 0
B. 1/9
C. 2/9
D. 1/3
E. 1
答案是c,可是我算了半天，怎么总觉得是是d啊。 | 
