The correct answer is: D. Can have any colour you choose.
The background of any Word document can be any color you choose. You can change the background color by going to the Design tab and clicking on the Page Color button. You can then choose from a variety of colors or use a custom color.
Option A is incorrect because the background color of a Word document does not have to be white. It can be any color you choose.
Option B is incorrect because the background color of a Word document is not always the color you preset under the Options menu. You can change the background color at any time, even if you have already preset a color under the Options menu.
Option C is incorrect because the background color of a Word document does not have to be the same for the entire document. You can change the background color for different sections of the document, or even for individual pages.
Option E is incorrect because the background color of a Word document can be any color you choose.