How do Shem the Penman and Shaun the Post differ ?

A. while Shem is a conformist, Shaun is a talented artist
B. while Shem would rather be a priest, Shaun is happy at his work
C. while Shem is a postman, Shaun is a artist and writer
D. while Shem is an artistic outsider, Shaun is a dull conformist