Explain the energy ladder

This describes the change in energy-use and demand patterns in accordance to the variations in economic status of the household. the lower the income of the households, the more they rely on biomass fuels, such as wood and dung

It should be at the center of any map going vertically: the prime meridian, as it passes through greenwich,  england, is considered 0 degrees longitude

Ibelieve your answer would be answer choice a