According to your textbook, if you quoted harvard business professor john b. matthews on the strengths and weaknesses of u. s. business schools, you would be using testimony.

Expert Testimony.

Explanation:

According to my research on the different types of testimonies, I can say that based on the information provided within the question you would be using the term known as Expert Testimony. This is basically a statement of truth given by a person that is a complete professional in that certain topic and has years of experience which is why they are considered an expert.

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i think it's b or c hope this