39. Albert: How does this sound? Wanted: male student or young professional for bright, sunny room in mixed flat-share. Must be clean, tidy and easy-going. Close to shops, pubs and buses. Reasonable rent,... Gina: Shouldn’t we say something about the cat? He might be allergic. Albert: Ooh, yeah, good point. What are they doing? They are writing __________. (A) an advert to share their flat (B) a note left on their fridge (C) a reminder to their landlord (D) a sales poster to promote some items。