The correct answer is - c. command.
North Korea is a country where the government is controlling everything in the country, natural resources, media, production facilities, agricultural land...
The country is functioning on the basis and ideologies of the communism since it was formed, and it seems that it will stay that way for the foreseeable future.
Since the government is controlling the economy, and it is in the way of self-sustainability, so the economy is of the command type.
Ocean ridges are been formed due to The upwelling of magma from the asthenosphere.
What is Ocean ridges?
Mid-ocean ridges can be regarded as a process which do occur along divergent plate boundaries.
This occurrence do happen where new ocean floor is created when the Earth's tectonic plates spread apart.
- It should be noted that As the plates separate, there would be rise in molten rock.
Therefore, option B is correct.
Learn more about Mid-ocean ridges at,:
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The currents would travel all the way around the earth parallel to the equator
The capital of Greece is Athens
The tropical rainforest is a biome with a constant temperature and a high rainfall. The level of humidity and density of the vegetation give the ecosystem a unique water and nutrient cycle. Rainforests around the world are threatened by human expansion.