Question

which question would form the best basis for a quality research paper?
○ a. how much cardiovascular exercise can an 80 - year - old man do every day?
○ b. are people who exercise healthy?
○ c. what kind of person is healthier: an obese person or a fit person?
○ d. how does exercise improve heart health?

Explanation:

A quality research paper requires a question that is specific, measurable, and allows for in - depth exploration. Option D asks about the mechanism of how exercise improves heart health, which is a scientific inquiry that can be studied through research methods such as experiments, literature reviews, and data analysis. Option A is too specific to an 80 - year - old man and may not be generalizable. Option B is a yes/no question which limits the scope of research. Option C is a comparison question but is rather broad in terms of what "kind of person" is defined.

Answer:

D. How does exercise improve heart health?