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

Which of the following classes is the superclass of '"Air-castle: pail of milk to be sold."'?

A. "Air-castle shattered by lack of forethought."
B. "Castle in the air"
C. "Absurd plans. Air-castles."
D. "Task: build castle in air."

Answer: "Air-castle shattered by lack of forethought."