A reasonable view of the choice of using your friend as expert testimony is D. The friend’s insights are valuable as peer testimony.
Peer testimony is a testimony given by a person without the required specialist expertise in a particular matter.
Peer testimony serves as an assertion made by someone who has experience or knowledge of a particular matter. For example, your friend who has a brother with childhood Type I diabetes.
Thus, a reasonable view of the choice of using your friend as expert testimony is Option D.
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