Answer:
- Peer Testimony.
Explanation:
As per the question, the type of supporting material that Kim used would exemplify 'peer testimony' that is demonstrated as an assertion made by a person who might not be a proficient or expert in the field but instead having a personal experience with the subject. 'Peer testimonies' stand direct in contrast to 'expert testimonies' which are usually the testimonies(statements) proposed by a person who has expertise in that particular field or subject. Thus, the statement Kim included from the speech exemplifies a 'peer testimony'.