Task: Class Definition Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following definitions best describes 'public subway train'?

A. A morphological quality inhering in a bearer by virtue of the bearer's affording not completed blocked passage or view.
B. A shopping center in which a large indoor pedestrian promenade provides access to stores and other facilities.
C. A subway train which is owned by a government or other form of public representation.
D. A tornado which comprises two or more columns of spinning air rotating about their own axis and at the same time around a common center.

Answer: A subway train which is owned by a government or other form of public representation.