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

Which of the following classes is one valid superclass of 'septate phloem fiber cell'?

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

Answer: phloem fiber cell