Question

sensory encoding of the perceived location of a stimulus depends on
which labeled line is active.
the frequency of action potentials.
the specific sensitivity of the peripheral receptor.
the specific location of the cortical neuron that is stimulated.
the number of receptors stimulated.

Explanation:

Sensory encoding of a stimulus's perceived location is based on the labeled - line principle. Each sensory pathway (labeled line) is dedicated to a specific type of sensory information (including location). When a particular labeled line is active, the brain interprets the stimulus location based on that specific pathway.
The frequency of action potentials (option 2) is related to stimulus intensity, not location. The specific sensitivity of the peripheral receptor (option 3) is more about the type of stimulus (e.g., touch, pain) it responds to, not location. The specific location of the cortical neuron that is stimulated (option 4) is a result of the labeled - line activation, not the initial determinant. The number of receptors stimulated (option 5) is also related to stimulus intensity (more receptors stimulated may mean a stronger stimulus in some cases) rather than location.

Answer:

which labeled line is active.