All of the options listed can be ways to exhibit professionalism, but if you’re looking for the most direct ways, "Certifications" and "Speech" particularly stand out as they indicate a level of expertise and communication skills that are crucial in professional settings.
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Certifications: Obtaining relevant certifications shows that you have met certain standards and possess a level of knowledge or skill in your field.
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Speech: Effective communication, including how one speaks in professional settings, is a clear indicator of professionalism.
However, teamwork is also essential in a professional environment, as working well with others reflects positively on one's professionalism.
Ultimately, if you had to choose one answer from the list that most universally represents professionalism, "Certifications" would be a strong choice, but acknowledge that all these factors contribute to overall professionalism.