The correct answers are the limbic system and emotional.
"…This is because of the sense of smell projects directly to the limbic system which is responsible for emotional memories. "
The reaction Randolph had is because of the sense of smell projects directly to the limbic system which is responsible for emotional memories. That is why he remembers when he was walking down the Street as a child with his parents smelling the scent of freshly baked pie.
The structures that lie on both sides of the Thalamus are the limbic system. It’s under the brain. Scientists consider that the limbic system is responsible to create emotions. Along with the autonomic nervous system, the limbic system is the creation of emotions when we remember something.