Correct answer: A. Bolshevik side
Explanation: Direct answer: Option A is correct. During the Russian Civil War, the Red Army was the military force associated with the Bolsheviks and the new Soviet government. After the 1917 Russian Revolution, the Bolsheviks had to fight several opponents, often called the White forces. The Red side defended and expanded Bolshevik control. Option A is correct because it directly identifies the Red Army with the Bolshevik side. Option B is wrong because the Tsarist monarchy had been overthrown, and supporters of the old order were associated with the opposing White forces, not the Red Army. Option C is wrong because the British Parliament was a foreign political institution, not the side represented by the Red Army. Option D is wrong because French nobles had no role as the identity of the Red Army; this option belongs to a different historical context. Do not confuse colour labels: Red means Bolshevik or revolutionary forces, while White generally refers to anti-Bolshevik opponents. Exam cue: Red Army equals Bolsheviks; White forces opposed them.