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'.
Q: Problem: toby is 4 years younger than debby . thrice the sum of the ages of toby and debby equals their mother ' s age . if the age of the mother is 60 , find the ages of toby and debby ?
Options: a ) 8 and 12 , b ) 5 and 9 , c ) 6 and 10 , d ) 5 and 10 , e ) 12 and 16
A:
a