The correct answer is: A. Page : Book
A facade is the front or face of a building, especially one that is designed to impress. A page is a single sheet of paper in a book or other publication. The two words are related in that they are both parts of a larger whole. A facade is part of a building, and a page is part of a book.
The other options are not correct because they do not have the same relationship as the original pair of words. A dial is part of a watch, but it is not the same as the watch itself. A neck is part of a bottle, but it is not the same as the bottle itself. A fence is part of a garden, but it is not the same as the garden itself.