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

Which of the following definitions best describes 'Stem rust incidence'?

A. Percentage of plants in a plot showing symptoms of smut.
B. Severity of the symptoms of bird damage observed in a plot
C. A qualitative analysis of the type of stem rust symptoms that are exhibited.
D. Percentage of plants in a plot showing symptoms of stem rust.

Answer: Percentage of plants in a plot showing symptoms of stem rust.