Answer:
They both believe in the magic.
Step-by-step explanation:
The short story "The Monkey's Paw" by W. W. Jacobs revolves around the magical ability of a monkey's paw in fulfilling three wishes to its owner. The story relays the message the greed is never good for anyone, let alone bring people happiness.
Mr. White acquired the talisman from his friend Sergeant Major Morris who had got it during his time in India. And he believed that the talisman brings harm more than luck, and threw into the fire. But Mr. White took it out and decided to keep it for himself. This shows that he somehow believed in the magical ability of the monkey's paw. And like her husband, Mrs. White as well as their son Herbert also believed in the paw's magic. Their conversation about the "two hundred pounds" and their belief that it'll be granted shows their belief in the monkey's paw and its magical abilities.
Thus, the correct answer is the third option.