In general, which best explains why communist revolutions did not happen

Capitalist governments enacted reforms

Explanation:

The communist party USA organized the workers into unions and lead them to ask for reforms. It came to seen by the United States as a threat and often called anti-nationals. But their presence and growing influence was not ignored. So the government enacted reforms like Insurance for health and unemployment to win public support.

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."