Task: Inferred Class Relation Reasoning (ontology: Food_Agriculture/PlantOntology)

After reasoning, which of the following classes is one valid superclass of 'LP.09 nine leaves visible stage'?

A. plant gamete
B. 1 main shoot growth stage
C. sepal abaxial epidermis
D. A megaspore mother cell enlarges stage

Answer: 1 main shoot growth stage