The main effect of the word "faces" in this sentence is that it implies a sense of history, since the "faces" are of the people who once lived there.
Questions that demand interpretation of a text are never easy, since different people can have different interpretations. In this particular text, when the narrator talks of "broken faces,"they are talking about the people who once lived at that place.
The whole sentence "Their broken faces spun stories in our minds," plus the continuation of the paragraph, indicate a sense of history. The narrator imagines those people's lives. They never knew them, but they can guess what their life was all about as he or she sees the ruins all around.
For that reason, option D seems to be the best answer. The faces are those people who lived before the narrator ever set foot on that beach.
Note: Many people seem to think option A is a good answer as well, as we saw during our research online. Option A would make more sense if we were focusing on the word "broken" instead.
Learn more about faces here:
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