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

Which of the following classes is one valid superclass of 'embryo hypophysis'?

A. 2.03 main shoot and axillary shoots visible at three nodes stage
B. 2.01 main shoot and axillary shoots visible at one node stage
C. 2.04 main shoot and axillary shoots visible at four nodes stage
D. embryo plant cell

Answer: embryo plant cell