Final answer:
Without access to Ashe's last paragraph itself, it's inferred that Ashe's approach to research is thorough, implying he may be seeking areas he's missed. This closely aligns with outcome D.
Step-by-step explanation:
Given the last paragraph of the excerpt and the information provided about Ashe's research methodology, it is not possible to accurately determine which conclusion about Ashe's research is best supported. However, one can make a reasonable assumption that since the passage discusses how an author might "fill in" what history does not tell us by creating a story of what "might have happened," this suggests a research approach that is thorough and detailed, seeking to cover areas that may have been overlooked, without contradicting known facts. This implies that outcome D, Ashe has researched the subject thoroughly and is now looking for what he may have missed, is a likely answer, should it align with the content of the last paragraph.