What type of rhetorical device is used here?

“there are forms of oppression and domination which become invisible – the new normal.” - michel foucault meaning?

Which sentence has an adjective clause? a.mike rode his bike on mountain trails because he found them challenging.b.gary donated to charity whenever he could.c.liz,who could always make people laugh,was loved by the whole block.d.ever since adam was a little boy,he had his father in the fields

In this unit we learned about arguments and rhetoric. in an argument we use ,not informal language