Read the following description: A young teacher in a difficult school is frustrated by the
conditions in which his students learn and becomes
convinced that his efforts to help his students learn and
improve their lives are wasted. He spends many years
feeling this way, until one day, a former student returns to
tell him that his teaching was inspirational and has
enabled the student to go on to a successful life.

Which statement best describes how the themes of this passage interact?

A. The results of one's actions are not always immediately seen, and
change happens in small increments.

B. It is important to maintain perspective on what really matters, and
people often turn crises to their own advantage.

C. Community is more important than individual achievement, and
greed takes many forms, some of them unseen.

D. Playing God is dangerous, and even the things that one thinks are
desirable sometimes turn out not to be.