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

Which of the following classes is one valid superclass of 'embryo sac central cell'?

A. BO.03 late boot stage
B. embryo sac cell
C. B enlarged microsporocyte stage
D. 2.02 main shoot and axillary shoots visible at two nodes stage

Answer: embryo sac cell