When a Stimulus Ascends a Particular Nerve to the Brain,and

When a stimulus ascends a particular nerve to the brain,and then initiates the flow of animal spirits through several channels and pathways there,before finally descending through a different nerve to excite a muscle,it follows Descartes' hypothetical mechanism for:

A) passions.
B) mind-body interaction.
C) innate reflexes.
D) acquired or learned reflexes.