All of the Following Are Problems with the Balance of Power

All of the following are problems with the balance of power theory EXCEPT states:

A) sometimes ally with former enemies in order to fight a stronger state.
B) sometimes ally with a stronger state instead of allying with others against that state.
C) sometimes ally with other states,not just to gain strength but because they share the same religion.
D) sometimes ally with states with whom they share an ideology,not because the allies offer the best military advantage.
E) do not always consider stronger states to be threatening and therefore do not balance against them.