A photograph of someone with back drops and studio lights
It happened in "The Fall of the House of Usher" (by Edgar Allan Poe) that while Usher and the narrator speaks, Usher's sister walks through the room, apparently unaware of the narrator. The narrator's reaction to seeing Usher's sister when he sees her pass through the room was with an utter astonishment not unmingled with dread.
I'm pretty sure the answer is D because it seems like the most logical statement that could be made by an explorer.
