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

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

A. Relative leafiness of a plant defined as how leafy a plant is.
B. An assessment of chlorosis symptoms.
C. The amount (weight) of green leaves per unit area or plant.
D. Proportion green leaves per unit area or plant.

Answer: An assessment of chlorosis symptoms.