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

The property 'has vector' applies to instances of 'vector quantity', and 'vector potential' is a subclass of 'vector quantity'. Which class can appear as the value of 'has vector' for instances of 'vector potential'?

A. vector
B. agricultural production facility
C. geothermal power plant
D. temperature depth derivative

Answer: vector