. . . . . . . . in the Tool Box is used to add a button control to a form.

The correct answer is: A. Button Tool

The Button Tool is a button control that is used to add a button to a form. It is located in the Toolbox, which is a collection of tools that can be used to create and modify forms. To add a button to a form, click on the Button Tool in the Toolbox and then click on the form where you want to add the button. A button control will be added to the form. You can then customize the button by changing its text, font, size, and color.

The other options are incorrect because they are not button controls. Option B, “Add Button”, is a menu item that is used to add a new button to the Toolbox. Option C, “New Button”, is a button that is used to create a new form. Option D, “Add new Button”, is not a valid option.