The books are . . . . . . . . the shelf. A. next to B. in C. on D. None of the above

The word “on” is used to indicate that something is located on top of something else. In this case, the books are located on top of the shelf.

The word “next to” is used to indicate that something is located next to something else. In this case, the books are not located next to the shelf.

The word “in” is used to indicate that something is located inside of something else. In this case, the books are not located inside of the shelf.

The word “none of the above” is used to indicate that none of the other options are correct. In this case, the word “none of the above” is not correct.