Question

1. There are three __________ in the library.
book's rows
rows books
rows of book
rows of books

Answer 1

There are three rows of books in the library.

The options are explained below:

• Rows of books (correct option): There are three rows. Hence, the word 'row' will be plural. Also, each row has multiple books. Hence, the word 'book' will also be in plural.
• Book's rows: Here, the apostrophe suggests the book is singular here. It should have been "books' rows".
• Rows book: Apostrophe is absent. Also, book is in singular
• Rows of book: None of the rows will have one book. So this is incorrect.

Answer 2

There are three rows of books in the library.

• Book's rows is not the correct option because 'book's' represent a single book being referred to.
• Rows books is not correct because a preposition is required in between the two words.
• Rows of book is not correct as there are many books and just not one book.
• Rows of books is the correct option as there are multiple rows, the preposition 'of' is correct and there are multiple books which are being referred according to the sentence.