In the Case Study in the Text, an Example Where

In the case study in the text, an example where the rate at which a bacterial population fills up a test tube is described. What does this example illustrate about populations?

A) Bacteria grow really fast.
B) There are not enough test tubes to contain all the bacteria in a population.
C) It is relatively easy to manage population growth.
D) Once you realize your population is getting pretty large, you don't have much time to react before it's too late.
E) Population grows out of control and there's really nothing that can be done about it.