Final answer:
The event that contributes to the rising action in 'The Monkey's Paw' is when Morris tells the Whites about the magic of the monkey's paw, setting the stage for the escalating conflict.
Step-by-step explanation:
The event that contributes to the rising action in "The Monkey's Paw" is C. Morris tells the Whites about the magic of the monkey's paw. The rising action of a story includes events that build tension and develop the conflict. When Morris informs the Whites of the paw's magical properties, it sets the stage for the consequential actions and decisions they make, which escalate the tension and lead to the climax of the story.