Noxious means that something is dangerous, or harmful to someone or something.
An independent clause is a clause that can stand on its own, by itself. It does not need to be joined to any other clauses, because it contains all the information necessary to be a complete sentences. Independent clauses have three components: They have a subject - they tell the reader what the sentence is about.
A-the housemates sit around the radiant fireplace
I think it's "c" because i don't see no error.