The correct answer is: A. Controls
Controls are the basic elements of a form or a report. They are used to display data, perform actions, and interact with the user. Some common controls include text boxes, labels, buttons, and list boxes.
B. Objects are not the basic elements of a form or a report. Objects are created from controls and are used to represent data or perform actions. For example, a button object is created from a command button control.
C. Windows are not the basic elements of a form or a report. Windows are containers for controls and objects. They are used to organize the user interface and to display data.
D. Properties are not the basic elements of a form or a report. Properties are used to customize the appearance and behavior of controls and objects. For example, the Text property of a text box control is used to specify the text that is displayed in the control.