Gasoline is a complex mixture of many organic compounds, with various additives that provide for a suitable automobile fuel. It is produced through refining operations from crude oil, which is a natural blend of many different hydrocarbons found in underground reservoirs in certain parts of the world.
Here's a graph showing the stages. Look closely at the second stage-- the death rate is low but the birth rate is high. It's <span>D. The death rate begins to fall, but birth rates remain high for a time.</span>