Find a line reference that says how much
wealth the medievalists thought that women controlled!
You can't
In response to the question task, we should go back to the passage and ask "what do we know about these medievalists, and furthermore, about our author's opinion of them?"
Upon reading the first few lines of the passage, we get this: they distinguished public law from private law (government/military vs family, social, and land), and our author thinks this is "overly simplistic" (ie, wrong).
Then we get the tell-tell pivot word "Although" and the information that follows, "Although excluded from public roles,
women's control of land had important political implications." Which is to say "Although the medievalists are right about X, they are wrong about Y."
Contrary to what the medievalists said, land and politics (ie public and private law) go together when it comes to women and land!
This is (E).