Final answer:
The excerpt from Dr. Jekyll and Mr. Hyde reveals Dr. Jekyll's internal conflicts and aspirations, which lead to the creation of Mr. Hyde (b) as an expression of his darker side.
Step-by-step explanation:
The excerpt from The Strange Case of Dr. Jekyll and Mr. Hyde helps to resolve the plot by revealing Dr. Jekyll's internal conflicts that lead him to create Hyde. This reflects his intense reflection on the dual nature of mankind, where he perceives a deep divide within himself between good and evil. His scientific curiosity and moral struggles drive him to experiment with his darker side, ultimately leading to the manifestation of Mr. Hyde.