Are is the correct answer. Was would be past tense and therefore would need travelled. Is doesn't work for plurals so therefore it must be are
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The element of a speech which can establish tone and rhythm to engage the audience is
B. Word choice.
<em>Depending on the people you are talking to, whether young people or adults for example, one catches their attention by including corresponding stylistic devices or proverbs in the speech, and raise or lower your voice emphasizing parts those parts.</em>