Thank you for the opportunity to help you with your question!
The answer is choice A.
It is choice A because the only chocice that logically requires scientific experiment. Choice A is a Scientific question. Scientific question is the 2nd step on the scientific method, an experimenter ask a question that can be done by an experiment. So like the question asks, you can perform an experiment on choice A.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 19th, 2015
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