The graph below depicts the earnings of A and B over the period 2000 to 2010:From the graph, which one of the following can be concluded?

• A. On the average A earned more than B during this period.
• B. On the average B earned more than A during this period.
• C. The earnings of A and B were equal during this period.
• D. The earnings of A were less as compared to B during this period.