Answer :
This is not a valid source because C. The author does not any reliable sources to support his claims. he also uses his opinion in various statements.
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.