Final answer:
The intensity of a stimulus determines the size of a neuron's response in terms of the rate and number of action potentials and the number of receptors activated, which is processed in the CNS.
Step-by-step explanation:
In response to the question regarding a neuron's response to stimulation, the intensity of the stimulus determines d) the size of the response. The size of the response in this context refers to the rate of action potentials produced by the sensory receptor. A more intense stimulus results in a higher frequency of action potentials, while a less intense stimulus will produce a lower frequency of action potentials. Additionally, an intense stimulus might also activate more receptors, further contributing to the size of the neuronal response. The integration of this sensory information begins in the central nervous system (CNS) where the brain processes the incoming signals and leads to appropriate responses, such as muscle contraction or gland secretion.