What Is the Difference Between a Concrete Image and an Abstract

What is the difference between a concrete image and an abstract concept?

A) All concrete images are the same, while every abstract concept is different.
B) Each concrete image is a sophisticated idea, while each abstract concept is a simple idea.
C) A concrete image shows something you have seen before, while an abstract concept shows something you have only imagined.
D) A concrete image is of a physical object, while an abstract concept is of an idea or feeling.