Why is this not a suitable research paper topic?
why the death penalty should be abolished
it is not researchable.
it involves an opinion.
it is too broad of a subject.
it is too narrow of a subject.

It involves an opinion

Explanation:

Typically when one does a research paper, it's asking about a question you can answer with facts. For example, Why do frogs lose their tail when they grow up?, is a topic you can do a research paper on. I hope this helps

to show how the cables work.