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

Suppose an individual ?x satisfies: divalent inorganic anion(?x). Which conclusion is one valid inferred conclusion?

A. trivalent inorganic anion(?x)
B. inorganic anion(?x)
C. inorganic cation(?x)
D. aluminium ion(?x)

Answer: inorganic anion(?x)