Use this excerpt from the "Why are yawns contagious? We asked a scientist" article to answer the question.

How does the last sentence in the excerpt help validate the inference that yawn contagion is a form of imitation?

(1 point)

by discussing the evolutionary role of smiling

by emphasizing the importance of communication

by summarizing other types of empathetic responses

by explaining similar forms of social mirroring

The excerpt does not discuss any of the answer options listed.

The last sentence in the excerpt, "Yawning contagion might be our oldest, most basic form of empathy," helps validate the inference that yawn contagion is a form of imitation by explaining similar forms of social mirroring.