What distinguishes the behavior of a radio control from a check box on an HTML form?

What distinguishes the behavior of a radio control from a check box on an HTML form?

A.
A radio control allows generic push buttons, whereas a check box submits a form.

B.
A radio control allows multiple choices, whereas a check box supports an exclusive choice.

C.
A radio control supports an exclusive choice, whereas a check box allows multiple choices.

D.
A radio control submits a form, whereas a check box allows generic push buttons.