A patient's radial nerve was completely severed during an open mid-shaft humeral fracture 8 weeks ago. The fracture is now healed. The physical therapist is about to conduct a manual muscle test (MMT). Based on the level of the injury, where would the physical therapist MOST LIKELY expect to find complete motor loss during the MMT?

a) shoulder extension, elbow extension, wrist extension, and finger extension
b) elbow extension, wrist extension, and finger extension
c) wrist extension and finger extension
d) finger extension