Answer:
c. Jekyll’s dark side embodied in a separate being
Step-by-step explanation:
In "The Strange Case of Dr Jekyll and Mr Hyde," by Robert Louis Stevenson, Jekyll creates a potion in his laboratory to restrain his evil, so he turns into a corrupt and barbarus creature: Hyde. As his creation becomes more violent and cruel, Jekyll also has problems to control his transformation, so he begins to metamorphose as Hyde in his sleep and to engage in criminal activities - including murder.