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

The property 'has habitat' applies to instances of 'organism', and 'Bacteria' is a subclass of 'organism'. Which class can appear as the value of 'has habitat' for instances of 'Bacteria'?

A. food production environmental monitoring zone 2
B. environmental system
C. rainy day
D. solid layer

Answer: environmental system