In line with the liberal International Relations theory, the scholars who focus on internal factors in explaining foreign policies of states assume that states are not unitary actors and what goes within states matter a lot. Moreover, whether a country is ruled by democratic or non-democratic regimes might affect how that country defines its foreign policy interests and act accordingly. 

The institutional structure of democratic regimes as well as the democratic values held by the people would likely prevent states from taking costly decisions and resorting to war. The checks and balances structure in state administration, the need on the part of politicians to secure the votes of
electorate for upcoming elections and the consensus building culture among different constituencies would all prevent the ruling elites from taking costly decisions in foreign policy. However, this does not mean that democratic regimes would never adopt coercive foreign policy strategies in their dealing with non-democratic countries.

Thus, the correct answer is B.