This prompt asks students to consider which arrangement of magnets has the most energy associated with it. Considering the energy stored in a configuration of magnets may be a stretch in a typical intro class. At the same time, students should know that opposite poles attract, like poles repel, and that the closer those poles are together, the stronger the force  -- and use anticipated motion to make claims about stored energy.  I anticipate the following possible wrong ideas that would reveal something about student thinking about energy:  (a) reject the idea that there is energy in the system when the objects are still; (b) think of energy of magnets as similar to energy stored in a battery - a kind of "resource" that is independent of orientation; (c) think of force as directly correlated to the energy stored.