Final answer:
The tragedy in the passage is conveyed through Willy's life ending as he was ready to retire, his son Happy's lack of understanding, and Linda's inability to cry, making option C (I and III) correct.
Step-by-step explanation:
The tragedy of the passage concerning the end of Willy Loman's life is mostly captured by multiple factors. The first factor, I. Willy's life is over just as it seems he was ready to retire and enjoy it, highlights the tragic irony of his timing. The second factor, II. Willy's son Happy still doesn't get the greater picture concerning his father's death, suggests the ongoing nature of the family's lack of understanding and the persistence of Willy's flawed legacy. Lastly, III. Linda can't cry, reflects on the emotional numbness and the devastation that is too deep to find an immediate outlet in tears. Given these points, the true depth of the tragedy encompasses all these aspects, making option C (I and III) the correct answer as it best captures the tragic essence of the passage.