Compared to fossil fuels, which of the following is the most significant advantage of using biofuels as a source of energy?

• Sustainability
  Biofuel use has many benefits over fossil fuels, such as being less harmful and toxic to the environment. Although fossil fuels are cheaper to buy, biofuels rule because they come from homegrown crops that are sustainable.
• Low price
  Biofuel use has many benefits over fossil fuels, such as being less harmful and toxic to the environment. Although fossil fuels are cheaper to buy, biofuels rule because they come from homegrown crops that are sustainable.
• Energy efficiency
  Biofuel use has many benefits over fossil fuels, such as being less harmful and toxic to the environment. Although fossil fuels are cheaper to buy, biofuels rule because they come from homegrown crops that are sustainable.
• Less toxic
  Biofuel use has many benefits over fossil fuels, such as being less harmful and toxic to the environment. Although fossil fuels are cheaper to buy, biofuels rule because they come from homegrown crops that are sustainable.