The correct answer is B. checkbox.
A checkbox is a type of input control that allows users to select one or more options from a list. When a checkbox is checked, its value is set to 1. When it is unchecked, its value is set to 0.
A combo box is a type of input control that allows users to select one option from a list. The list of options is displayed in a drop-down menu. When a combo box is selected, its value is set to the selected option.
A radio button is a type of input control that allows users to select one option from a group of options. The options are displayed in a circle, and only one option can be selected at a time. When a radio button is selected, its value is set to 1. When it is unchecked, its value is set to 0.
A text box is a type of input control that allows users to enter text. The text that is entered into a text box is stored as a string.
I hope this helps!