The correct answer is C) the author does not cite any reliable sources to support his claims.
You know that the text is not a reliable source because the author does not cite any reliable sources to support his claims.
When writing an essay or a research text, it is very important to have facts that support your arguments. These kinds of texts need data, facts, cites, numbers, and statistics; nor opinions. In the case of the example, the author gives his opinion, not reliable sources. For instances, he uses phrases like "I think its capital city..." or I bet it conquered nearly..." So it is true that the author does not cite any reliable sources to support his claims.