A historian publishes a paper on the ancient Greek leader Alexander the Great. However, most scholars reject his paper on the basis that the research is not reliable. Which factor could have led to this conclusion? A. The historian chose a subject that was unpopular among other scholars. B. The paper credited too many sources by renowned historians. C. The paper showed signs of bias and lacked proper citations. D. The historian taught history at a prestigious but small university. E. The historian regularly maintained personal historical blogs.