Which sentence is the best example of foreshadowing?

a. he next equipped his son in the same manner and taught him how to fly, as a
bird tempts her young ones from the lofty nest into the air.
b. while he gave him these instructions and fitted the wings to his shoulders, the face of the father was wet with tears, and his hands trembled.
c. he kissed the boy, not knowing that it was for the last time.
d. then rising on his wings, he flew off, encouraging him to follow, and looked back from his own flight to see how his son managed his wings.