Which of the above ideas might be considered foreshadowing?

Question

His skin tone is really pale
The narrator thinks he is laboring with an oppressive secret
His voice is quivering
He is wandering all over the chamber

Answer 1

The narrator thinking he is laboring with an oppressive secret could be considered foreshadowing. It suggests that there may be something significant or troubling about the character that will be revealed later in the story.