Action potentials travel the length of the axons of motor neurons to the axon terminals. these motor neurons

The motor neurons protrude from spinal cord or brain towards sarcolemma.

Explanation:

The central nervous system contain motor neurons. These neurons axons move outside from the CNS. The axons projected outside the CNS control muscles directly or indirectly. The motor neurons are multipolar that is single axon in each cell and many dendrites.

Action potentials travel the length of the axons of motor neurons to the axon terminals. These motor neurons protrude from spinal cord or brain towards sarcolemma. The sarcolemma is a thin sheath that surrounds the skeletal muscle fibres.

i think that c)gold was found there

but i am not sure