A PTA is performing a UE muscle test on a patient diagnosed…

A PTA is performing a UE muscle test on a patient diagnosed with radiculopathy and records the following muscle grades:  Shoulder flexion: 4+/5, Elbow flexion: 4-/5, Elbow extension: 4+/5, Wrist extension: 3-/5, and gross Finger extension: 4+/5.  Which of the following cervical spine nerve roots is MOST likely affected?