Task: SWRL-based Rule Reasoning (ontology: Earth_Environment/EnvironmentOntology)

Suppose an individual ?x satisfies: phosphate ion(?x). Which conclusion is one valid inferred conclusion?

A. trivalent inorganic anion(?x)
B. arsenic oxoanion(?x)
C. phosphorus oxoanion(?x)
D. divalent inorganic anion(?x)

Answer: phosphorus oxoanion(?x)