In a group discussion, which sentence is most clearly challenging the
credibility of a source?
o
a. i disagree with gutierrez completely that quantum computers will
be faster than current computers
8. gutierrez's article is way too old to say anything relevant about
computer science today
c. when gutierrez refers to gubite, she's talking about the field of
quantum computing
d. the purpose of gutierrez's article is to make a point, not to teach a lesson about something technical

B). Gutierrez's article is way too old to say anything relevant about  computer science today.

Explanation:

Establishing the credibility of the claims proposed is one of the most crucial steps for an author/speaker to persuade the readers and evoke the desired response as an unreliable claim may not only degrade one's credibility but also lead to disappointment and embarrassment. Therefore, the claims require to be based on 'reliable sources' so, it could be justified with sufficient evidences and neglect the counterclaims effectively.

As per the question, the statement that most evidently challenges the credibility of the source is displayed through option B as it suggests that 'Gutierrez's article is too old ...to...relevant' that disproves the 'validity of the source'. Thus, option B is the correct answer.

the right answer is 6