Asystem of beliefs or ideas that justifies the social, moral, religious, political, or economic interests held by a group or by society is
a.
a social movement.
c.
an ideology.
b.
a cultural lag.
d.
a vested interest.

The correct answer is C. An ideology.

Explanation:

An ideology can be defined as the different beliefs as well as values that a person or a group in society has. An ideology is usually based on reality's presumptions that eventually could have a real basis. The term is used in economic and political aspects as a way to describe their ideas' systems and in this way establish economic and political policies.

In political science, an ideology is utilized to make a description in terms of the political belief systems.  

a result is the answer

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.