Final answer:
Little Brandon fell off his tricycle and scraped his knee. At first, he cried out in pain, but when he rubbed his knee, the pain went away. This can be explained by the Gate control Theory.(option a).
Explanation:
The phenomenon where Little Brandon scraped his knee and felt relief from rubbing it can be explained by the Gate Control Theory. When Brandon rubbed his knee, he likely activated the body's natural pain control system in which non-painful input closes the "gates" to painful input, which prevents pain sensation from traveling to the central nervous system. This is due to the fact that physical stimulation can override and reduce the sensation of pain, acting through a mechanism in the spinal cord that blocks the pain signals before they reach the brain.
Hence, the correct answer would be a) Gate control.