Directions: Read the words and rearrange it to create correct sentences.

The correct answer is: She is reading a book.

Both 'She is reading a book.' and 'Is she reading a book.' follow the correct sentence order. However, the sentence 'Is she reading a book.' does not end with a question mark but a full stop. This is an incorrect sentence formation. Hence, the correct option is 'She is reading a book'. Here, 'she' is subject, 'is reading' is verb and 'a book' is object. So, it is the correct sentence pattern.