Name the angle that is supplementary to angle C O B. A diagram is shown. A horizontal line is shown with point A at the left and point D to the right. Between these two points, a diagonal line crosses the line at point O. This line is oriented from the lower left to the upper right with point F is at the lower left and point C is at the upper right. From point O, a ray extends upward through point B. A small square is at the intersection of line A B and ray O B.

A. Angle upper A upper O upper F

B. angle C O D

C. Angle upper B upper O upper F

D. Angle upper D upper O upper C