The north korean government controls every aspect of the economy. all decisions are made by the government as to what will be produced, for whom, and how it will be produced. north korea's economic system can mostly be classified as a a) modern economy. b) market economy. c) command economy. d) traditional economy.

Easy, look at what all the economies mean, and then pick the one that best fits North Korea's economy.

Modern Economy: A type of economy where it focuses not only on source of production; it also looks at the role of demand, money supply, and its effect on free trade. (international trade with no tariffs/restrictions)

Market Economy: An economy in which decisions regarding distribution/production; are based on the market determined supply/demand.

Command Economy: This economy, the government decides what goods should be produced, how much, and the price of the goods.

Traditional Economy: An economy where traditions/customs/beliefs shape goods/services, along with rules and the manner of distribution.

Thus, C, command economy is your answer.

It's  C) Command Economy. 
In a command economy, the government makes all decisions.