Task: Property Constraint Reasoning (ontology: Earth_Environment/EnvironmentOntology)

The property 'realizes' applies to instances of 'process', and 'environmental system process' is a subclass of 'process'. Which class can appear as the value of 'realizes' for instances of 'environmental system process'?

A. alkane metabolic process
B. soil percolation rate
C. realizable entity
D. amount of nitrogen atom in water

Answer: realizable entity