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

Which of the following classes does '"River flows from man's head."' belong to? Context: "Terminal motif F715.1.4"

A. "Animal swallows man (not fatally)."
B. "Extraordinary source of river."
C. "Armless people."
D. "Animal sinks into earth."

Answer: "Extraordinary source of river."