I believe the best answer is C.
We can learn the beliefs and practices of people in the community by community immersion or we will live in there community to observe and interact with the people (participant observation). Doing an initial community diagnosis will identify the most significant health problem in the community. Doing a participatory action research will also make us understand disease in the community.
The answer is theory development.
That's it because if you were a scientist, you couldn't collect data if you were forming a theory. I mean, how would you create a theory if you haven't even collected any data?!?!
That's my answer for ya!
Why doesn’t this let me respond?