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

Which of the following definitions best describes 'Calyx plug method'?

A. Observe the presence of grey mold on the plant or fruit.
B. Observe and rate the resistance of the plant to leaf scorch caused by Diplocarpon earlianum.
C. Observe the presence of absence of a central plug remaining in the fruit after manual calyx removal.
D. Observe and rate the average fruit flesh color on 3-5 fruit per genotype.

Answer: Observe the presence of absence of a central plug remaining in the fruit after manual calyx removal.