Taking into account the following options the one that led to the growth of both Prussia and Austria is D.
(A) The Peace of Westphalia limited the sovereignty of the Holy Roman Empire.
(B) Religion ceased to be a cause for warfare after the Peace of Westphalia.
(C) The disappearance of the plague in the eighteenth century led to a population explosion in Prussia and Austria.
(D) The concept of an effective balance of power developed in central Europe.
