Window is to pane as book is to

The correct answer is page.

A window is a frame with a pane of glass that lets in light and allows people to see outside. A book is a collection of pages bound together between covers. The pages of a book are what contain the text and images that make up the book.

The other options are not as good matches for the analogy. A novel is a long story that is written in book form. Glass is a hard, brittle material that is often used to make windows. A cover is the outer part of a book that protects the pages.

In conclusion, the correct answer to the question “Window is to pane as book is to” is page.