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The research question that is most effective is A. How did natural gas affect the ozone layer in 1975?
<h3>What is a research question?</h3>
It should be noted that a research question simply means the question that the researcher seeks answers to.
In this case, the research question that is most effective is "How did natural gas affect the ozone layer in 1975?". It must reflect what the researcher wants.
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And that is why I think animals should<span> be free of the cruelty scientists expose them to because they have just as much sentient as humans do.</span>
The second one only represents a cause and no effect, the others both list the effects of the causes. hopefully this helps.
