For a Group of Muscles Innervated by a Single Spinal

For a group of muscles innervated by a single spinal nerve, the tendon reflexes are absent but voluntary movements are preserved, although they may not be functioning perfectly. What can you deduce about the possible neuronal circuits/structures that are damaged?

A) upper motor neurons are damaged but lower motor neurons are not
B) lower motor neurons are functioning correctly but local interneurons are damaged
C) lower motor neurons are damaged and basal nuclei are not
D) upper motor neurons are functioning correctly but lower motor neurons are damaged