Agnes Is Talking with Bert and Ernesto, and They Are

Agnes is talking with Bert and Ernesto, and they are discussing object-oriented programming. Agnes is asking some detailed questions that Bert and Ernesto can’t answer. You agree to help answer the questions.
-Ernesto then wants to know what you call a single instance of an entity,and you tell him that it is a(n) ____.

A) object
B) paradigm
C) attribute
D) none of the above