What is the difference between socialism and communism

Question

A Socialism was only ever used in the Soviet Union in the twentieth century and was not adopted anywhere else’s in the world
B Socialism focuses on ending social differences while communism focuses on creating communal similarities
C in socialism people share power collective; in communism a group or person leads the people to their goals of eliminating classes
D Both are completely identical ways of eliminating class difference and have not been successful in achieving their goals

Answer 1

C in socialism people share power collectively; in communism, a group or person leads the people to their goals of eliminating classes