The mutiny of infantry regiments took the February Revolution to which stage?

Correct answer: From street demonstration to crisis of the state's military power

The governing concept is revolutionary escalation: a protest becomes a political crisis when the institutions that enforce state authority stop obeying the ruler. In Petrograd in February 1917, workers first organised demonstrations against shortages, war conditions and autocratic rule. The decisive development was the refusal of soldiers to fire on the demonstrators and the mutiny of infantry regiments. Because the army was the main instrument available to defend the tsarist government, this mutiny created a crisis in the state's military power and made the old regime unable to control the capital. Therefore option A correctly describes the transition. The other options mention unrelated religious, commercial or banking changes and do not explain the revolution's decisive military turning point.