"Among some of the reasons why unmitigated skepticism is difficult for a person to consistently hold as a serious philosophical position is because"

It is based on dogmatism.

Explanation:

While Skepticism is a term in philosophy, which is considered as a behavior, or a form of doubt in relation to the truth of a particular thing or situation. It stated that absolute certain knowledge is impossible.

On the other hand, Unmitigated skepticism which is a form of skepticism, claims that categorically and dogmatically it knows that no one knows anything. This appears contradictory and apparently self-defeating.

Hence, among some of the reasons why unmitigated skepticism is difficult for a person to consistently hold as a serious philosophical position is because it dogmatically accept a position or knowledge that no one knows anything, which is self-defeating and contradictory.

A. Otto I gained support by choosing a pope who supported him.