The correct answer is: A. check box.
A check box is a small square box that can be selected or deselected. It is used to represent a binary choice, such as "Yes" or "No", "On" or "Off", or "True" or "False".
An option button is a small circle that can be selected to represent one of a group of mutually exclusive choices. It is often used to represent a single choice from a list of options.
A toggle button is a button that can be turned on or off. It is often used to represent a setting that can be turned on or off, such as "Sound On" or "Sound Off".
A list box is a box that displays a list of items from which the user can select one or more items. It is often used to represent a list of options from which the user can choose.