Task: Property Constraint Reasoning (ontology: Sciences/Biology)

The property 'directly supplies and drains' applies to instances of 'capillary', and 'capillary of small intestine' is a subclass of 'capillary'. Which class can appear as the value of 'directly supplies and drains' for instances of 'capillary of small intestine'?

A. heart valve development
B. cerebellar Purkinje cell layer morphogenesis
C. anatomical structure
D. anatomical border

Answer: anatomical structure