As far as I know they never ask for three debates - the most is two, with three historians. I'm personally preparing two debates, and examining two historians within each debate.
well for the exam im preparing 2 debates and ive got 3 historians i know really well and just throwing in some others if i need to. ahha i bet im gonna have a freakout in the exam. im not preparedddddddddddd. meep. oh well. bloop