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

Which of the following classes is one valid superclass of 'SE.01 one node or internode visible stage'?

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

Answer: stem elongation stage