The listener that engages in civil discourse with Elaine is Arathi who asks Elaine what she meant by something she said.
Why this is the correct answer: Civil discourse involves respectful conversation where participants listen to each other, seek to understand different perspectives, and engage meaningfully with the content of what is being discussed. Arathi's action of asking for clarification demonstrates an interest in understanding Elaine's viewpoint, which is a key component of constructive dialogue. In contrast, the other responses—Yoon-sang interrupting with his own views, Cam being distracted by their phone, and Janelle expressing disagreement non-verbally—do not reflect the principles of civil discourse.