The correct answer is e) producing digestive enzymes.
The central nervous system (CNS) is primarily made up of the brain and spinal cord and plays a crucial role in processing sensory information, coordinating movements, influencing emotional states, and mediating learning and memory. Each of the first four options describes functions that are well within the domain of the CNS. However, the production of digestive enzymes is a function of the digestive system, specifically carried out by organs such as the pancreas and salivary glands, rather than the CNS.