Why was the Military Revolutionary Committee decisive in the October Revolution?

Correct answer: It linked military preparation of the uprising with Soviet politics

The Military Revolutionary Committee was important because it connected political authority with practical military action. It worked under the Petrograd Soviet and helped organise soldiers, sailors, guards, communications and important places. Thus, the uprising was not merely a sudden street disturbance; it was planned and coordinated through an institution linked with the revolutionary political body.

Option A is correct because it expresses both parts of this role: military preparation and Soviet politics. The committee helped decide how power would be taken and directed forces during the action. The other choices are unrelated: it did not restore the Tsar, turn the Duma into a market, or prolong the war for twenty years. Therefore, its decisive contribution was organised seizure of power under Soviet leadership.