Read these lines from the poem "Facing It" by Yusef Komunyakaa: A white vet's image floats close to me, then his pale eyes look through mine. I'm a window. He's lost his right arm inside the stone. In the black mirror a woman's trying to erase names: No, she's brushing a boy's hair. Which sentence best describes one effect of the poet's use of metaphor in this excerpt?
A. It contrasts the action of making a pencil rubbing of an engraved name and erasing a name from the wall.
B. It shows the difference between a mirror that reflects images and a window that admits light.
C. It gives the speaker the quality of empathy to show that he is open to the pain of other Vietnam veterans.
D. It attributes human qualities to the wall to emphasize how it brings together people from all walks of life.