Which of the Following Does the Text Mention as a Function

Which of the following does the text mention as a function of logical definitions?

A) They provide us with a sense of how a concept has developed over time.
B) They provide a list of paradigmatic examples for the concept.
C) They tell us what part of speech the concept is.
D) They provide a summary statement about the concept's referents.
E) They tell us how to use the word in a grammatically correct way.