To solve this question, the user needs to know about form controls that enable them to add menus to a form. In this case, the user must identify the correct name of the control used to add menus to a form.

Now, let's go through each option and explain why it is right or wrong:

A. FormMenu: This option is incorrect. There is no control named FormMenu that is used to add menus to a form.

B. MenuForm: This option is incorrect. There is no control named MenuForm that is used to add menus to a form.

C. MenuControl: This option is incorrect. Although it sounds like it could be the correct answer, there is no control called MenuControl that is used to add menus to a form.

D. MainMenu: This option is correct. MainMenu is the name of the control that is used to add menus to a form. A MainMenu control can be added to a form, and then individual MenuItem objects can be added to the MainMenu control.

E. Menu: This option is incorrect. Although it sounds like it could be the correct answer, there is no control simply named Menu that is used to add menus to a form.

The Answer is: D