Answer: C) The metaphor of the window shows that the speaker is empathetic to the pain of other Vietnam veterans.
Explanation: a metaphor is a figure of speech that consists in making a direct comparison between elements that aren't obviously related, in order to create an image in the reader's mind. In the given lines from the poem "Facing It" we can see an example of a metaphor in the line "I'm a window" this metaphor shows that the speaker is empathetic to the pain of other Vietnam veterans (corresponding to option C).
