The answer is D hope this helps
I kind of forgot as I learned that last year. sorry
Answer:
I am not sure but I think the answer is of option B.
Answer:
I think the 3rd one is the answer
We can see that the research question that is most effective is: D. What are fossil fuels?
<h3>What is research question?</h3>
Research question is actually known to be a question which is asked by a researcher which forms the basis for his evaluation, examination, and experimentation. Every good research question must be clear and focused.
We see that the selected answer is actually clear and focused and covers other aspect of the research.
Learn more about research on brainly.com/question/6947486
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