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

Which of the following classes is one valid superclass of 'eighth order infructescence axis'?

A. BO.03 late boot stage
B. 4 root elongation stage
C. 2.02 main shoot and axillary shoots visible at two nodes stage
D. higher order infructescence axis

Answer: higher order infructescence axis