Answer: d. Embodiment
Explanation: Our brains are designed in such a way that there are regions that we use to do certain activities.we have responses that help our brains perform routine work for us without even having to think in many instances.the message is sent to our brains by neurons where if ever theres something that we need to respond onto the impulse is directed to our brains as a message that we interpret to initiate that response.in this situation the message is transmitted chemically because our bodies are made up of 70% water which it works as a medium for transmission of impulse.