Answer:
those above him/her couldn't serve
Explanation:
Attorney General is seventh in the line, so it is unlikely that something like this can happen. Still, in the case it happens it will happen only when those above him are not able to perform their duty. Of course this never happened in history.
I would need the diagram to answer this but people on other resources state that B is the correct answer :)
Good Luck
<span>New Nationalism is that plan</span>
Hope this satisfies your query! Have a good one :)