I believe the answer is Adjective Clause because some signal words that give away that it could be an Adjective Clause is THAT, Which, Who, Whom, and Whose. And the word "That" is part of the underlined section, correct?
Answer:
The way an author looks at a topic or the concepts being described is referred to as the author's viewpoint. The substance and language used to display the data are referred to as viewpoint. The author's point of view, ideas, theories, assumptions, and possible bias are all deciphered by thoughtful readers.
Explanation:
