As economic theories, socialism and communism sought to
a. encourage private ownership of businesses.
b. even out inequalities of wealth.
c. encourage little government oversight.
d. build housing and schools for workers.

The correct answer is B.

The main objective of socialist and communist economic systems was to achieve economic and income equality among all members of society.

In order to ensure so, goverment would intervene in every aspect of the the economy, everybody would have a job position and earn an equal salary and all the property will be public (therefore, private properties had to be nacionalized).  

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.

the spanish  

hope this meaning spain btw