Task: Inferred Class Relation Reasoning (ontology: Food_Agriculture/PlantOntology)

After reasoning, which of the following classes is one valid superclass of 'megasporangium wall'?

A. upper glume of pedicellate spikelet of tassel
B. cardinal part of multi-tissue plant structure
C. corolla spur
D. leaf lamina vein

Answer: cardinal part of multi-tissue plant structure