B. The portfolio symbolizes Clarence's hopes and hard work.
Explanation:
In this example, the author describes the problems that Clarence faces when he is trying to get to his interview. Despite the fact that Clarence did his best to arrive on time, he got a flat tire, which completely ruined his plans. As the author describes this problem, he tells us that the portfolio that Clarence was meant to give to the CEO would never be seen. The portfolio is used as a symbol in this passage. Just like the portfolio became useless in a moment, so did Clarence's hard work and hopes which were not going to help him get that job.
