Task: Instance Class Understanding (ontology: Arts_Media_Entertainment/Propp)

Which of the following classes does '"Fairies become birds every other year."' belong to? Context: "Terminal motif D624.2"

A. "Fairy gains the power to fly."
B. "Transformation: fairy to bird."
C. "Special characteristics: fairies."
D. "Yearly transformation."

Answer: "Yearly transformation."