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

Suppose an individual ?x satisfies: SdPb M mgkg(?x). Which conclusion is one valid inferred conclusion?

A. Shoot dry weight - Computation(?x)
B. Seed strontium concentration(?x)
C. Seed chromium content - Measurement(?x)
D. Variable(?x)

Answer: Variable(?x)