Which event clearly showed workers' unity in the February Revolution?

Correct answer: Strikes in many factories after one factory lockout

The direct answer is A: strikes in many factories after one factory lockout. Workers’ unity means that workers in different workplaces act together for a common demand or in support of one another. In the February Revolution, a lockout at one factory helped trigger sympathy and protest among workers in other factories. Step by step, one workplace faced a dispute; workers elsewhere learned of it; many joined strikes; the protest therefore became a wider movement instead of remaining local. Option A is correct because several factories participated together, clearly showing solidarity. Option B is wrong because decorating the Tsar’s palace did not represent workers’ protest or unity. Option C is wrong because silence by the Duma would show inaction, not collective worker action. Option D is wrong because the arrival of foreign soldiers was not the event that demonstrated unity among Petrograd workers. Exam cue: a local labour dispute becoming a city-wide strike shows class solidarity.