The Real Cost “Science Class:Which rhetorical element (Ethos, Pathos, Logos) best helps  a ad convey its message?

PSA: The Real Cost “Science Class” [link: https://www.youtube.com/watch?v=GKHq5WsASUM.

Is the PSA effective or ineffective at delivering its message?

Which rhetorical element (Ethos, Pathos, Logos) best helps  a ad convey its message?