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

The property 'causal relation between material entity and a process' applies to instances of 'material entity', and 'material anatomical entity' is a subclass of 'material entity'. Which class can appear as the value of 'causal relation between material entity and a process' for instances of 'material anatomical entity'?

A. single-species collection of organisms
B. neurotransmitter
C. process
D. environmental system process

Answer: process