Which One of the Following Best Illustrates Concept Mapping

Which one of the following best illustrates concept mapping?

A) Alexandra lists the characteristics of the concept insect.
B) Bob draws a chart listing the sequence of events leading up to World War II in chronological order.
C) Christina puts the words force, gravity, velocity, acceleration, and time on a piece of paper; she then draws lines between pairs of related words and describes the relationships.
D) Darnell makes a chart showing the hierarchy that biologists use to classify animals; his chart includes such concepts as vertebrates, invertebrates, mammals, fish, birds, mollusks, and crustaceans.