If the options are:
A. what you already know about the topic
B. your favorite book or story of all time
C. how long you planned to read that day
D. who else has mentioned the book to you
Then the correct answer is A. what you already know about the topic. This is the only relevant thing for the reading, and not your favorite book, or plans for the reading, or recommendations. Many books often require some kind of foreknowledge about the subject. For example, if you want to read a novel about WW2, you will need to know at least the basics of this historical event. Even if you don't know too much about it, try to remember some basic facts.
