It can be anything with a big heat capacity like water
A chemical reaction is a reaction that changes the molecular structure and is normally irreversible.
I think its C i don't know if i am right
"High temperatures make the gas molecules move more quickly" is the one sentence among all the choices given in the question that most likely explains why this reaction is carried out at high temperature. The correct option among all the options that are given in the question is the third option or option "C".
That's a ketone's functional group :)