To determine the correct statement about the diseases:
- Disease A is described as rare and contained in a small geographic region, which suggests that it has not spread widely enough to be considered an epidemic.
- Disease B has affected people in several U.S. states and shows more cases than expected, indicating that it is widespread and has affected a larger population than normal, which aligns with the definition of an epidemic.
Given this information, the correct statement is:
There was an outbreak of disease A and an epidemic of disease B.