The correct answer is: D. no article
A book is like a mirror because it can reflect the reader's own thoughts and feelings. When we read a book, we are transported into the world of the author and see the world through their eyes. This can be a powerful experience, as it can help us to understand ourselves and others better.
The other options are incorrect because they all imply that a book is a specific object. However, a book can be any type of book, from a novel to a textbook to a self-help book. It is up to the reader to decide what they want to get out of a book, and the book will reflect that.
In conclusion, the correct answer is: D. no article. A book is like a mirror because it can reflect the reader's own thoughts and feelings.
