Final answer:
Hamlet's contemplation of Yorick's skull signifies a deep understanding of mortality and the ephemeral nature of life, leading him to confront his own existence.
Step-by-step explanation:
The significance of Hamlet's contemplation of Yorick, the court jester he knew in his youth, lies in his profound realization about the universality and inevitability of death. When Hamlet holds Yorick's skull, he ponders the finality that comes with death—an end that not only erases one's physical presence but also the jovial moments one shared. This pivotal moment in Shakespeare's play serves as a profound philosophical insight for Hamlet, emphasizing the fleeting nature of life and the inescapable truth that even the most vibrant of individuals will one day be reduced to mere bones.
The correct answer to the student's question is (D): He is stunned that someone who was once so alive could permanently cease to exist, and this realization forces Hamlet's consciousness of his own mortality.