Final answer:
GABA is related to inhibitory postsynaptic currents (IPSCs), due to its role in hyperpolarizing the postsynaptic membrane and reducing the likelihood of action potential firing.
Step-by-step explanation:
GABA, or gamma-aminobutyric acid, is associated with inhibitory postsynaptic currents (IPSCs), making the correct answer A) Inhibitory Postsynaptic Current (IPSC). When GABA is released from a presynaptic neuron, it binds to and opens Cl- channels, allowing Cl- ions to enter the cell and hyperpolarize the membrane. This hyperpolarization increases the membrane potential's distance from the threshold for firing an action potential, thereby inhibiting neuronal activity.