During a keynote presentation, the speaker mentions that she is the head of neurology at a major medical center. The speaker then goes on to discuss why wearing helmets is important for bicyclists of all ages. What factor of credibility has the speaker attempted to establish

Competence

Explanation:

Credibility generally has three different types of elements or factors, and includes, competence, compassion, and confidence.

Hence, in this case, when the speaker mentions that she is the head of neurology at a major medical center, she is trying to let the audience understand or know that she is competent or has competency in telling them the dangers involved in not wearing helmets for bicyclists of all ages.

Therefore, the correct answer is COMPETENCE.

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the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.