Answer:
B. correlational research.
Explanation:
Correlational research is a type of non-experimental research in which researchers measure two variables and establish a statistical relationship between them (correlation), without the need to include external variables to reach relevant conclusions. In the case shown in the question above, we can say that Dr. Little's research is a correlational research, since he is evaluating the relationship between two variables, which is the relationship between people's age and conservative policies.
Body mass index is the actual measurement of body fat, not a method with which to measuring it.
it could all be coming from different things but linked as well the back pain could be from your slepping positions,posture or from the extra weight (depending on how much you gained ) headaches from ear infections or flus maybe not enough sleep