During an Electromyography Exam the Therapist Observes Fibrillation Potentials

During an electromyography exam the therapist observes fibrillation potentials.What might these indicate?

A) Lower motor neuron disorders such as peripheral nerve lesions
B) Primary muscle disease such as muscular dystrophy
C) Irritation of the anterior horn cell such as with nerve root compression
D) Upper motor neuron syndrome such as cerebral vascular accident