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

Which of the following definitions best describes 'Southern blight disease severity method'?

A. Quantification of symptom development, Flowering (R6).
B. Quantification of symptom development in leaves, Primary leaves (V2).
C. Quantification of symptom development, First Trifoliate leaf (V3), Pod filling (R8)
D. Observe hypocotyl pigmentation and record it.

Answer: Quantification of symptom development, First Trifoliate leaf (V3), Pod filling (R8)