Subject: mathqa
Question: 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 ?
Option: 
A: 0
B: 1 / 3
C: 2 / 9
D: 1
Answer: C