A is false because communism was conceptualized way before. B is false because communism was never dominant and socialism was tried many times. C is false because there aren't many modern democracies trying communism, but dictatorships.
The answer is D:
Socialism allows for some private ownership of property and businesses, but communism has the government hold all property
Many say that socialism is a step towards communism. It's a "middle ground" and many countries tried to implement this.
The primary distinction between modern communism and socialism is that socialism allows for some private ownership of property and businesses. The communism on the other hand has the government holds all properties.
I think they chose that to begin and start there paper that way because it was important to state to the colonists that they were being heard and valued, just as well as everybody else did.
