Final answer:
The Red Army was comprised of Bolsheviks, workers, and peasants, and was a crucial militant force for the Bolsheviks during the Russian Civil War as they sought to consolidate power and establish a communist state.
Step-by-step explanation:
The groups that made up the Red Army during the Russian Civil War were primarily b) Bolsheviks, workers, peasants. The Red Army was the military force organized by the Bolshevik leaders, which included Leon Trotsky, to fight against various groups that comprised the White Army. This army constituted individuals and entities determined to fight for control of Russia, with the Bolshevik's version of communism as a driving force for their actions. For the Bolsheviks, the Red Army was a key element in consolidating their power and establishing a communist state. In the context of the Russian Revolution and subsequent Civil War, the Red Army fought relentlessly to defeat their varied opponents, including the White Army coalition of monarchists, liberalists, ethnic minorities seeking independence, and forces sent by foreign powers.