Which Correctly Lists the Sequence of Structures That Action Potentials

Multiple Choice

Which correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction?

A) sarcolemma,axon of neuron,T tubules
B) T tubules,sarcolemma,myofilament
C) muscle fiber,axon of neuron,myofibrils
D) axon of neuron,sarcolemma,T tubules
E) myofibrils,myofilaments,mitochondria