What well-known story does this folktale seem to echo?

The correct answer is B) Cinderella.

This folktale often echoes the themes of Cinderella, such as a kind but mistreated protagonist, a transformation, and the eventual triumph over adversity with the help of magical elements or a benevolent figure. These common threads connect many versions of the Cinderella story across different cultures. If you have more specific details about the folktale in question, feel free to share!