If the properties of the form are not listed alphabetically, click . . . . . . . . button to make it alphabetical.

The correct answer is: C. A-Z button.

The A-Z button is used to sort the properties of a form alphabetically. This can be helpful if the properties are not listed in a logical order. To use the A-Z button, simply click on it and the properties will be sorted alphabetically.

The other options are not correct. The Lexicographical button is not a real button. The Alphabetical button is the same as the A-Z button. The Arrange button is used to arrange the properties of a form in a different way, such as by category or by date.