The issue with the research paper based on the information given is D. It is too narrow.
It should be noted that a research paper is a type of academic writing which provides an in-depth analysis, evaluation, or interpretation of a single topic, based on empirical evidence.
Since Anthony wants to use the question “What is the best-selling cell phone of all time?” to write research paper, this is too narrow.
It should be noted that a research paper should be concise and gives information about what's to be explained.
In this case, the issue with the research paper based on the information given is that is too narrow. Therefore, the correct option is D.
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