Let it go and figure the problem will take care of itself. The best answer is b. Your child may be avoiding books because he hasn't found any that engage him. A child who doesn't love books and reading may have problems in school down the road, so don't ignore his lack of interest. You should also consider having his eyesight checked.
Vision problems can make reading frustrating.
It's falling apart because we read it every night. I don't know. My child does most of his reading at school, not at home. It's at the library. I don't want my child to read the same book over and over at home.