The Graph Below Shows Estimated World Population for the Period $4000 B C = 2000 A D$

Multiple Choice

The graph below shows estimated world population for the period $4000 B C = 2000 A D$ . Note that the logarithm of the world population and not actual population is plotted on the vertical axis. This means, for example, that when the graph reaches 7 on the vertical scale, world population is $10 ^ { 7 }$ and when the graph reaches 9 on the vertical scale, world population is $10 ^ { 9 }$ . Use the graph to answer the question.
-During the period 4000 BC to 1000 BC, approximately what was the doubling time for world population?

A) Approximately 23,000 years
B) Approximately 1000 years
C) Approximately 3000 years
D) Approximately 5000 years