Which of the Following Customer Profiles Uses Demographic Descriptors Exclusively

Which of the following customer profiles uses demographic descriptors exclusively?

A) Peter is an IT consultant earning $95,000 per year and loves reading science and technology magazines.
B) Bobby is at university, works part- time and has recently formed a punk rock band.
C) Marcia, aged 18 years, is studying for a Commerce degree and is a high achiever.
D) Cindy is enrolled at primary school and loves playing with her Barbie Doll.
E) Greg, aged 40 years, is divorced and has custody of his three dependent children.