Task: Class Relation Understanding (ontology: Business_Finance/Occupation_Ontology)

Which of the following classes is one valid superclass of 'first-line supervisor of mechanic, installer, or repairer'?

A. advertising, marketing, promotions, public relations, or sales manager
B. agricultural worker
C. academic degree
D. supervisor of installation, maintenance, or repair worker

Answer: supervisor of installation, maintenance, or repair worker