The answer would be C because he rolled down his window, I can’t think of anything else that rolls down it’s window except other vehicles.
The answer to the question is C.
The only word that could potentially be a compound noun is patents, but that has its own definition-a government meeting of some sort.
A compound noun would be a compound word that is also a noun, but there aren't really any compound words.
I know this doesn't really help, sry.
To show who is talking. Who specifically.
