Final answer:
The population of interest is people in the community. The community surveyed a random sample of 600 residents to compare the regular church attendance rate in their area to the nationwide percentage.
Step-by-step explanation:
The population of interest in this study is B: People in the community. The community wanted to compare the regular church attendance rate in their area to the nationwide percentage. Therefore, they surveyed a random sample of 600 residents in their community.