Task: Class Relation Understanding (ontology: Food_Agriculture/PlantOntology)

Which of the following classes is one valid superclass of 'chalazal and micropylar domain establishment stage'?

A. 1 main shoot growth stage
B. endosperm development stage
C. N second mitotic division stage in germinating pollen
D. 2 formation of axillary shoot stage

Answer: endosperm development stage