Answer:
Prompting Dr. Jekyll to ask Mr. Utterson to promise that Mr. Hyde will receive what is left to him in the will.
Step-by-step explanation:
Robert Louis Stevenson's "The Strange Case of Dr. Jekyll and Mr. Hyde" revolves around the story of a good doctor who had an evil alter ego. The story deals with themes of science, the complexity of life, loyalty, good vs. evil, etc.
I n the given excerpt, Dr. Jekyll and his lawyer Mr. Utterson are in conversation about Mr. Hyde. When Utterson pressed Jekyll about Hyde and how he did not trust that man, Dr. Jekyll insists that his relationship with Hyde is "very strange . . . and cannot be mended by talking." This conflict in their interest in Hyde helps develop the plot by prompting Jekyll to force Utterson to promise he (Utterson) will help Hyde when Jekyll is no more.
Thus, the correct answer is the third option.