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

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

A. cation(?x)
B. inorganic cation(?x)
C. polyatomic ion(?x)
D. organic cation(?x)

Answer: cation(?x)