In what way does luther’s letter support the point of view of the historian in source b

I've seen this question before -- I'm guessing you're working with a chapter on European Renaissance and Reformation that featured a secondary source (source B) reference from historian Steve Ozment.  In document A, from a letter to the pope sent by Martin Luther, Luther accused the Roman Catholic Church of having become a den of thieves, that the whole hierarchy needed reform.  That early letter (from 1520) supports Ozment's claim that Luther's Reformation movement began as a protest against "arbitrary, self-aggrandizing hierarchical authority" in the church.  

Possess private property.