In the Following Situation, State Whether Two Variables Are Related

In the following situation, state whether two variables are related in a way that might be described by a function. If so,
identify the independent and dependent variables.
-You make a list of the titles of books in a public library and their copyright year.

A) Independend variable, book title; dependent variable, copyright year
B) Independend variable, copyright year; dependent variable, book title
C) does not describe a function