D. An undisclosed disease that he had harbored for years. DR. Lanyon had died as a result of falling ill
Answer: Just try your best
Explanation:
Summer rain is imagery a type of figurative language. And what figurative language can do to a story is set the tone, and when it is imagery it can create the setting.
The mood (or tone) of the prologue is considered as sombre, dark, macabre... since from the start we're being told that this story is going to be a story of love, death and loss.