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Read the scenario about a formal discussion.

During a formal academic discussion, Samir listens to and acknowledges the viewpoints of others. He also waits until it is his turn to speak and uses diction and syntax appropriate to the topic. However, he fails to provide reasons or evidence to help explain his point of view.
Which skill should Samir improve to become more effective at participating in a formal discussion?

understanding social cues
supporting opinions with facts
showing respect to other participants
using language fit for a formal discussion