The effect of the word "enchantment" on the overall meaning of the story most aligns with the choice:
It alludes to the children's belief that Miss Lottie possesses superhuman powers as a witch.
The use of the word "enchantment" suggests a magical quality to Miss Lottie's presence and possibly implies that the children, despite their mundane surroundings, perceive her as having some extraordinary influence or strength that protects her home from the elements. This idea resonates with themes of childhood perception and the mystical qualities they attribute to adults and their environments.