My provision of the salt, which had never been renewed since the date of the first experiment, began to run low. I sent out for a fresh supply and mixed the draught; the ebullition followed, and the first change of colour, not the second; I drank it and it was without efficiency. You will learn from Poole how I have had London ransacked; it was in vain; and I am now persuaded that my first supply was impure, and that it was that unknown impurity which lent efficacy to the draught. –The Strange Case of Dr. Jekyll and Mr. Hyde,
Robert Louis Stevenson

How does this part of Dr. Jekyll’s confession provide information about his struggle to control his good and evil sides?

a. It shows the terrible things that can happen as a result of changing personalities too often.
b. It explains what allowed him to split himself in two and why he can no longer continue to do so.
c. It explains where he located the supplies for the potion and how he plans to get more.
d. It shows the difference between Dr. Jekyll’s potion-making skills and Mr. Hyde’s.

ANSWER IS: b. It explains what allowed him to split himself in two and why he can no longer continue to do so.