How does the mood in “the monkey's paw” foreshadow what happens in the story?

the mood lightens considerably once the whites receive a visitor, which hints that the story will end happily.
the mood darkens throughout and hints that the story will end in sadness, loss, and terror.
the mood remains constant throughout the story and hints that the ending will not be suspenseful.
the mood darkens throughout the story and hints that the whites are greedy and uncaring.