To answer this question, we need to understand the relationship between the words "window" and "pane".
A window is made up of multiple panes, which are individual sections of glass within the window frame. Therefore, a pane is a part or component of a window.
Now, let's apply this relationship to the options given:
Option A) Novel - This option is incorrect because a novel is a type of book, but it is not a part or component of a book like a pane is to a window.
Option B) Glass - This option is incorrect because glass is a material that can be used to make a window pane, but it is not the equivalent of a pane in the context of a book.
Option C) Cover - This option is incorrect because a cover is the outer protective layer of a book, but it is not the equivalent of a pane in the context of a window.
Option D) Page - This option is correct because, like a pane in a window, a page is a part or component of a book. A book is made up of multiple pages, just like a window is made up of multiple panes.
Therefore, the correct answer is option D) page.