What is the probable relationship between the two speakers

A．Bookstore assistant and customer.
B．Teacher and student.
C．Librarian and student
D．Father and son.

A．one should never revisit his hometown after many years of absence
B．one will never find his hometown the same as it was in his childhood memory
C．a visit to one's hometown will bring back one's fond memories of home
D．a visit to one's hometown will bring back many sad memories