What was the main organisational difference between Bolsheviks and Mensheviks?

Correct answer: Bolsheviks wanted a disciplined small party and Mensheviks wanted a broad party

The organisational dispute concerned who should be a member of the revolutionary party and how tightly the party should be organised. Lenin’s Bolsheviks favoured a relatively small, disciplined and closely coordinated party of committed professional revolutionaries. The Mensheviks preferred a broader party with a larger membership and a less restrictive structure, believing that a wider workers’ organisation was more appropriate. Both groups were socialist and opposed the Tsarist system, so the difference was not that one merely advised the Tsar or that both abandoned politics. Option C accurately states the main organisational contrast.