Answer:
The correct answer is option D, that is, cerebral cortex.
Step-by-step explanation:
The outermost layer of the brain's gray matter is known as the cerebral cortex. It is the site where the maximum amount of integration occurs mainly when one is testing the effect of the temperature of a substance on a human body.
This is due to the fact that the sensory information gets transmitted to the cerebral cortex via the thalamus. After that, processing of the sensory information is done by the cerebral cortex with the assistance of various nerve cells, which helps in integrating the stimulus of the temperature of the substance with other sensory stimuli. Eventually, the signals get transmitted to the spinal cord via the cerebral cortex and the movement takes place.