Answer:
The theme that this passage best support is Hiding a secret can be painful.
Step-by-step explanation:
This excerpt from The Strange Case of Dr. Jekyll and Mr. Hyde. shows how Dr. Jekyll feels trapped by his pain at hiding the secret of the reality of Mr. Hyde and all the terrible things that had happened around him. The character of Dr. Jekyll feels constantly tortured by his confusions and his guilt due to the results of his experiment.