Which 1905 event, in which imperial guards opened fire on peaceful protesters marching to the Winter Palace, triggered the first major revolution of the 20th century?

• A The Potemkin Mutiny
• B Bloody Sunday ✓
• C The Lena Massacre
• D Khodynka Tragedy

On 22 January 1905, troops fired on a crowd led by Father Gapon approaching the Winter Palace to present a petition to the Tsar; the massacre shattered popular faith in the monarchy.