⟩ In the history of Russian Revolution, what is Bloody Sunday?(a) It was the Sunday on which the entire family of lastCzar of Russia was massacred.(b) It was the day on which a mass of peaceful workers onits way to present a petition was fired upon(c) It was the Sunday when the sailors of the battleshipPotemkin joined the revolutionaries and were killed.(d) It was the day when hundreds of Bolshevikrevolutionaries were killed in a conflict with Mensheviks.