Why do competitive markets move equilibrium

At any other price, the quantity demanded does not equal the quantity supplied, so the market is not in equilibrium at that price. The word equilibrium means balance. ... However, if a market is not at equilibrium, then economic pressures arise to move the market toward the equilibrium price and the equilibrium quantity.In response to the lower price, consumers will increase their quantity demanded, moving the market toward an equilibrium price and quantity. ... In response to the demand of the consumers, producers will raise both the price of their product and the quantity they are willing to supply.

b: the establishment clause  

b: socialism  

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )