Which sentence from the excerpt is an example of foreshadowing?

(A) As they suddenly start toward the house.
(B)In this brief fraction of a moment they take the first step toward performing a metamorphosis that changes people from a group into a mob.
(C)They begin to head purposefully across the street toward the house at the end.
(D)The people stop as a group, seem to pause for a moment and then much more quietly and slowly start to walk across the street.