A main difference between capitalism and socialism is:

A. Individuals in a socialist economy make progress when they follow their self interest and manage their resources independent of government
regulation

B. the government intervenes in the economy, distributes resources and services to its people

C. there is a lot more competition in a socialist economy due to goverment participation in the market.

D. the government does not intervene in a socialist economy allowing for more freedom and more potential inequalities

I think this is the right one. A is wrong because 20th Century socialist economies (if this is what the question is referring to) were not individualist, no self interest. C is wrong because there is less competition in socialist economies (generally). And D is wrong because the government does internvene in socialist economies. So B is right, the government intervenes and tries to distribute resources evenly (as long as B is talking about a socialist economy which I think it is).