Asupporting text a.)adds information b.)proves something c.)makes logical judgments d.)examines something closely.

b) proves something.

Explanation:

The main purpose of a supporting text is to provide details that serve as a way of proving an argument presented in a text. When we chose a supporting text, we need to consider whether this does in fact provide enough information to support a claim that we are making. The use of evidence and supporting details will make our argument clearer, stronger and more persuasive.

c. explains words’ origins and variations.