Task: SWRL-based Rule Reasoning (ontology: Food_Agriculture/Crop_Ontology)

Suppose an individual ?x satisfies: Duration of heterophyllic period computation in days after planting(?x). Which conclusion is one valid inferred conclusion?

A. Tuber flesh color middle portion - Estimation(?x)
B. Total tuber yield computation in t/ha(?x)
C. Variable(?x)
D. Fruit harvest time estimation in yy/mm/dd(?x)

Answer: Variable(?x)