In which kind of economic system does the government control the businesses that affect most citizens, such as railroads and electrical power?: (
a.
populist
b.
unionist
c.
free-market
d.
socialist

It would be mostly in a "socialist" form of government in which the government controls the businesses that affect most citizens, such as railroads and electrical power, although this varies greatly depending on the country in question, and there's almost always an element of the free-market involved. 

Yea what that girl/boy said, she’s right