A. Because the process of creating books was so labor-
intensive before the invention of the printing press,
there were very few books available.
B.

Because books were only created in monasteries
before the invention of the printing press, only religious
texts were published, so there were very few books.
С.

Because books had to be written by hand, and
illustrations had to be added after each page was
complete, only very short texts were considered for
book-making.

D. because no one in Medieval Europe valued intellect and culture there was very little interest in creating books before the invention of the printing press.