Period a is known as
a.
history
b.
prehistory
c.
post history

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.

the answer is b hope that

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.