Answer :
Realpolitik is that a political decision about foreign engagement must be based on preserving the interests of your country above all. Realpolitik is a political concept that values the attainment of power by a nation above any other goal or ideological perspective on governance or foreign policy.
The correct answer is:
The concept that political decision about foreign engagement have to be based on preserving the interests of your country above all.
The concept Realpolitik refers to developing political activities based on practical and material determinants rather than on theoretical or ethical goals.
Realpolitik appeared in mid-19th century Europe from the contact of the ideas of Enlightenment with state organization and power politics.
In international relations, the concept of political realism refers to the understanding that states seek their interests by practicing Realpolitik.