Based on historical perspective, the estate(s) that would be least in favor of radical reform include the "The First Estate and the Second Estate."
Before the French Revolution in 1789, many French societies, particularly France was divided into three Estates.
The First and Second Estates constitute the Clergy and Nobility, respectively, at the topmost of the French society. They are free from paying taxes.
They also enjoyed other advantages such as wealth, vast lands, and some other privileges by birth.
However, the Third Estates pay taxes, and they don't have privileges in society.
Given that a radical reform would change the established societal structure, thereby making all the three estates equal with no privileges, the First and Second Estates would be least in favor of radical reform.
Hence, in this case, it is concluded that the correct answer is First and Second Estates.
Learn more about French Society before the Revolution here: https://brainly.com/question/555817
