PLEASE HELP WITH THIS MULTIPLE CHOICE QUESTION!!!
 What is one challenge that Russia faced after the fall of the Soviet Union? 
 A. It was difficult to elect a capable leader. 
 B. It was difficult to reunify eastern and western parts. 
 C. It was difficult to change from a command to a market economy. 
 D. It was difficult to sell oil and gas exports at a decent price on the free market.