The Connection Between Autonomic Ganglion Neurons and Their Presynaptic Neurons

The connection between autonomic ganglion neurons and their presynaptic neurons is such that

A) an action potential in any presynaptic neuron is capable of producing an action potential in the ganglion cell.
B) some "strong" presynaptic neurons can produce action potentials in the ganglion cell, while other "weak" neurons produce subthreshold potentials.
C) all presynaptic neurons produce subthreshold potentials that must summate to produce an action potential.
D) an action potential in any presynaptic neuron is capable of inhibiting any action potentials in the ganglion cell.
E) only g-protein coupled receptors are present on the ganglion cell, so presynaptic firing does not produce any direct changes in postsynaptic potential.