What is the respective ratio of the number of people preferring to travel by rail in 2006 to the number of people preferring to travel by rail in 2002?
a) 31 : 27
b) 31 : 23
c) 23 : 31
d) 27 : 31
e) None of these
a) 31 : 27
b) 31 : 23
c) 23 : 31
d) 27 : 31
e) None of these