Jekyll’s letter in the excerpt from "The Strange Case of Dr. Jekyll and Mr. Hyde" helps move the plot forward by causing Lanyon to go to Jekyll’s house to get the drawer. (option D)
Dr. Jekyll is a scientist who creates a potion that allows him to separate the two sides of his personality. The side known as Mr. Hyde is the evil one, capable of committing murder.
The chemicals that are used in the potion are in a certain drawer. When Jekyll writes the letter, Lanyon goes to his house to get that drawer, which helps move the plot forward.
With the information above in mind, we can select option D as the correct answer for this question.
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