Answer
Any pair of rays, besides Ray OA and Ray OD, are not opposite rays.
Work Step by Step
Any pair of rays, besides Ray OA and Ray OD, are not opposite rays.
Therefore...
Ray OA and Ray OB are not opposite rays.
Ray OA and Ray OC are not opposite rays.
Ray OD and Ray OB are not opposite rays.
Ray OD and Ray OC are not opposite rays.
Ray OB and Ray OC are not opposite rays.