Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Plant establishment'?

A. The amount in fresh weight basis of grain that was harvested per unit area or plant.
B. The number of plants established relative to number sown.
C. The amount in dry weight basis of grain that was harvested per unit area or plant.
D. The tendency of rachis breaking from spike peduncle at maturity.

Answer: The number of plants established relative to number sown.