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

Which of the following classes is one valid superclass of 'androecium development stage'?

A. collective phyllome structure development stage
B. 2.02 main shoot and axillary shoots visible at two nodes stage
C. B enlarged microsporocyte stage
D. 4 root elongation stage

Answer: collective phyllome structure development stage