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

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

A. 4 root elongation stage
B. 2.02 main shoot and axillary shoots visible at two nodes stage
C. higher order infructescence axis
D. IE.03 3/4 of inflorescence emerged from flag leaf sheath stage

Answer: higher order infructescence axis