Given the task definition and input, reply with output. In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: a sum of rs . 427 is to be divided among a , b and c in such a way that 3 times a ' s share , 4 times b ' s share and 7 times c ' s share are all equal . the share of c is ?
Options: a ) 23 , b ) 87 , c ) 84 , d ) 26 , e ) 19
c