How does this part of Dr. Jekyll’s confession provide information about his struggle to control his good and evil sides? It shows the terrible things that can happen as a result of changing personalities too often.
It explains what allowed him to split himself in two and why he can no longer continue to do so.
It explains where he located the supplies for the potion and how he plans to get more.
It shows the difference between Dr. Jekyll’s potion-making skills and Mr. Hyde’s.

What this part of Dr. Jekyll’s confession provide about his struggle to control his good and evil sides is:

Strange Case of Dr Jekyll and Mr Hyde is known to be a novella written by Robert Louis Stevenson.

The story gives a narrative about how complex science is. It further portrays the duplicity that resides in human nature.

Dr. Jekyll wanted and tried to control his ego for a while. But Hyde later took over and they later died.

Learn more about Strange Case of Dr Jekyll and Mr Hyde on link

the answer is both an appeal to ethos and logos (if that's what your question options were)

both are bitter over their mistake