When Looking at EMG Interference Patterns,a "Picket Fence" Appearance Suggests

When looking at EMG interference patterns,a "picket fence" appearance suggests a neuropathic lesion.The "space between the pickets" helps determine whether the neuropathy is due to an upper motor neuron lesion (UMNL) or a lower motor neuron lesion (LMNL) ,because:

A) With a LMNL,the problem is one of motor unit Activation,resulting in a larger space between pickets
B) With a LMNL,the problem is one of motor unit Recruitment,resulting in a larger space between pickets
C) With an UMNL,the problem is one of motor unit Activation,resulting in a larger space between pickets
D) With a UMNL,the problem is one of motor unit Recruitment,resulting in a larger space between pickets