Researchers are studying how the membrane potential of a postsynaptic neuron changes in response to neurotransmitter stimulation. Baseline measurements determine that the resting membrane potential is generated by high membrane permeability for a particular ion. When neurotransmitter stimulation begins, ligand-gated ion channels open (black arrow) and increase the membrane permeability for a different ion, causing a change in membrane potential. This triggers the delayed opening of voltage-gated ion channels (red arrow) , which increase the membrane permeability for a third type of ion. The results of the experiment are shown in the graph below. 
The equilibrium potentials of different ions under physiologic conditions are as follows: 
Which of the following options would best explain the changes in this neuron's membrane potential during the experiment?
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Funds due to a company from its clients for products or services provided on credit.
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The act of teaching the art of dance, encompassing a wide range of styles and techniques taught by skilled instructors.
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