Given the task definition and input, reply with output. In this task, you need to provide the correct option for a given problem from the provided options.

Problem: the ratio of three numbers is 3 : 4 : 7 and their product is 18144 . the numbers are
Options: a ) 9 , 12,21 , b ) 15 , 20,25 , c ) 18 , 24,42 , d ) 24 , 15,17 , e ) 30 , 12,7
c