Correct Answer: c, b, d, f, e, a

Solution : Given:
a. Book b. Words c. Letters d. Sentences e. Chapters f. Pages

Books are fascinating objects that consist of various elements that work together to convey a message or tell a story. The most basic building blocks of a book are letters, which are combined to form words. Words, in turn, are strung together to make sentences, which are then written on a page. As more pages are added, they are grouped into chapters, and these chapters collectively make up a book. Ultimately, a book is a carefully crafted piece of literature that can educate, inspire, entertain, or enlighten readers.

So, the sequence is Letters, Words, Sentences, Pages, Chapters, Book or c, b, d, f, e, a. Hence, the fourth option is correct.