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: total num of pupiles in 3 grades of scholl is 333 . the no of pupiles in grades 1 and 2 are un 3 : 5 ratio and 2 and 3 grades are 7 : 11 ratio . what is the strength of class that has highest no of pupils
Options: a ) 145 , b ) 155 , c ) 165 , d ) 175 , e ) 185
c