Here is a single or multi-choice question: How many propellers helped power the plane the Wright brothers flew into history ?

Would the answer to this question be an entity, an abbreviation, a description, a human, a location, or a numeric value?

Select from the following.
[I] description;
[II] entity;
[III] abbreviation;
[IV] human;
[V] numeric;
[VI] location;
[V]