Reading a Book You Checked Out from the Library Might

Reading a book you checked out from the library might seem to be an example of a recreational activity that is totally uncommercialized,but it is still directly connected to commercial activity and work because

A) you had to eat and pay for utilities on the day you went to the library.
B) you might learn something valuable by reading.
C) books from libraries are expensive, as they have expensive bindings.
D) people were paid to write, edit, print, ship, and shelve the book.