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.
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The answer could be :It all happened so suddenly.
An adolescent boy will grow taller and heavier, and hormones will lead to sexual maturity with developing chest.
Change the phrase "shooting the breeze" because it is too informal and cannot be understood literally.