The correct answer is C. Option button.
An option button is a small circle that is used to select one of a group of mutually exclusive choices. Option buttons are often used in dialog boxes to allow the user to select a single option from a list of options.
The property sheet for an option button includes settings for the option button itself, as well as for the option group that contains the option button. The settings for the option button include the text that appears on the option button, the value that is associated with the option button, and the appearance of the option button. The settings for the option group include the name of the option group, the type of option group, and the options that are included in the option group.
The option group label is a text box that is used to label an option group. The option group label is not a component of the option group itself, but it is associated with the option group. The option group label is displayed above the option group, and it helps to identify the options that are included in the option group.
The option group frame is a frame that is used to group a set of option buttons together. The option group frame is not a component of the option buttons themselves, but it is associated with the option buttons. The option group frame helps to visually group the option buttons together, and it also helps to ensure that only one option button in the option group can be selected at a time.
The option button labels are the text that appears on the option buttons. The option button labels are not components of the option buttons themselves, but they are associated with the option buttons. The option button labels help to identify the options that are included in the option group.