The right option is d. thalamus
"Ladoux proposes that sensory input arrives in the thalamus of the brain, which splits the signal, sending part of the message to the cortex and part of the message to the amygdala. The thalamus is the large mass of gray matter situated above the brain stem between the cerebral cortex and the midbrain. The main function of the thalamus is to relay motor and sensory signals to the cerebral cortex and amygdala. The thalamus also regulates alertness, consciousness and sleep.