Through what did communist ideas spread after the Russian Revolution?

Correct answer: Through parties, education and international organisations

After the Russian Revolution, communist ideas travelled beyond Russia through organised political parties, publications, educational activity and international networks. Supporters discussed these ideas in workers’ associations, translated literature, public meetings and movements that connected activists across countries. International organisations also helped communicate a common political programme and encouraged debate about social ownership and inequality. Option A is correct because it identifies several genuine channels rather than restricting the spread to one narrow institution. Royal courts, trade fairs and church prayers were not the principal organised mechanisms through which communist political ideas became influential internationally. The wider network explains their global reach.