Choice D would be the correct answer. Foreshadowing is essentially the term for literature when authors hint at events to come, and when I read choice D, it caused me to feel that there was something that the author had not told me yet, which is essentially the goal of foreshadowing. It is intended to get the reader expecting something else to happen. The other three choices, although they are statements as well, seem to be relating more to previous events as opposed to hinting at something to come. :)