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

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

A. heat flux
B. mesozooplankton
C. time period
D. vector

Answer: vector