The correct answer is: A. Stories about imaginary beast and creatures.
The folklore contains the traditions, customs and expressions of culture shared by a particular group of people. The tales, fairy tales, fables, legends, etc. common to a culture and all the characters present in the collective imaginary of the people, are part of its folklore.
We discard option C because it is incompatible with the concept of folklore, and option B and D are either religious or mythological.
