Task: Inferred Class Relation Reasoning (ontology: Business_Finance/Occupation_Ontology)

After reasoning, which of the following classes is one valid superclass of 'environmental engineer'?

A. grounds maintenance worker, all other
B. refuse or recyclable material collector (broad)
C. Homo sapiens
D. arts, communications, history, or humanities teacher, postsecondary

Answer: Homo sapiens