Cost determines the development speed of green fuel. Its biggest competitor, the petroleum industry, is in its heyday after more than 100 years of in-depth research and development, and most oil smelters currently operating have achieved a balance of payments. And biomass Fuel plants still require hundreds of millions of dollars in up-front investment. This cost must also be taken into account when calculating the price of green fuel. What is the most accurate summary of the main point of this passage? ['To calculate the price of green fuel, you need to consider the initial investment cost.', 'Relative to traditional oil, the cost of developing green fuels is at a disadvantage.', 'Oil is the biggest competitor for green fuel development.', 'Oil is in its heyday, and other fuels cannot compare to it.']