Which detail from the story "The Magic Prison" foreshadows the palace becoming a prison?

A.) He spent hours each day before first one mirror and then another; and he did not notice that the windows were growing narrower and the mirrors wider.

B.) “Humph!” she said, as he disappeared. “You’ll have enough of it before you are through, my fine prince.” And away she flew.

C.) But, strange to say, no sooner did he reach his hand out for a soft, mellow pear or a rich, juicy peach than another pear or peach took its place.

D.) “Poor little thing!” he cried, as he sprang up; “you too are shut within this terrible prison. This thick darkness must be as hard for you to bear as it is for me.”