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

Which of the following definitions best describes 'Powdery mildew susceptibility - Estimation'?

A. Observe stem hairiness and rate it. Usually observed at harvest time.
B. Observe Powdery mildew susceptibility and rate it.
C. Observe Bean bug susceptibility and rate it.
D. Observe Phyllosticta leaf spot susceptibility and rate it.

Answer: Observe Powdery mildew susceptibility and rate it.