Which of the following best describes what a thesis for a historical essay should be? a.) a well-researched fact b.) a summary of an event c.) an interpretive claim d.) an uncontestable statement

I believe the best answer for this would be D, an uncontestable statement. "Uncontestable" means accurate, authentic, or absolute. You would not want your thesis to be interpretive, which is subjective to the author's point of view. You would also not want a simple summary of an event because that does not make a thesis. Hope this helps.