what is a democracy?

a political regime where most political power effectively rests with a small segment of society.

a state or nation in which the supreme power is actually or nominally lodged in a king, queen, or emperor.

a situation where citizens make decisions about government.

a system of government by the whole population typically through elected representatives

It is the 3rd one

Explanation:

Democracies let the citizens decide, not Kings, queens, or certain groups in society.

each played a major role in ending the cold war.

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.