Read the sentence. Just as a river flows, with its unique but familiar course, its well-charted but troubling eddies and rapids, so our lives flow, all of a piece yet ever-changing.

What idea does the analogy explain?

A. For most people, life follows a calm and serene course.

B. It takes a skilled navigator to travel through life.

C. A human life consists of both routine and unexpected events.

D. Those who do not prepare in advance may invite disaster.

CORRECT ANSWER: C. A human life consists of both routine and unexpected events.