John Is 3 Times as Old as Martha

Multiple Choice

John is 3 times as old as Martha. Six years ago the sum of their ages was fifty-two. How old are they now?

A) John is 48; Martha is 16
B) John is 60; Martha is 20
C) John is 63; Martha is 21
D) John is 45; Martha is 15
E) John is 51; Martha is 17