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

Which of the following classes does '"Stroke of staff brings water from rock."' belong to? Context: "Terminal motif D1567.6"

A. "Magic object produces fountain."
B. "Transformation: man (woman) to golden object."
C. "Magic belt."
D. "Transformation to cow (bull, calf, etc.)."

Answer: "Magic object produces fountain."