Based on changes in the bacterial population of Group 3 , which statement best supports the germ theory? A. There are other types of bacteria present before Group 3 bacteria are found. B. Group 3 bacteria increase most rapidly during the first year. C. Certain diseases only occur when the population size of Group 3 bacteria is above a certain level. D. The frequency of disease increases during the years that the number of Group 3 bacteria remains constant.

## Step 1<br />The germ theory of disease states that microorganisms are the cause of many diseases. This theory is supported by the idea that the presence and growth of certain types of bacteria can lead to the occurrence of specific diseases.<br /><br />## Step 2<br />Looking at the options, we need to identify which one best supports this theory. <br /><br />## Step 3<br /> diseases only occur when the population size of Group 3 bacteria is above a certain level. This statement aligns with the germ theory, as it suggests that the presence of a certain type of bacteria (in this case, Group 3 bacteria) can lead to the occurrence of a disease.