Which of the following best describes where fossil fuels come from

So Fossil fuels are NOT made up of fossils! 
Now that we know that knowledge, i will tell you why they call it that.
Because these special fuels were made deep underground before the time of the dinosuars! see? (fossil fuels) Now we use these types of fuels to get engines like cars and trains going. But how? Well its the same thing that we eat! accept alot older. Plants from millions of years ago died and decomposed, they too back in the day collected sunlight and went through the process of photosythesis. CREATING ENERGY! So, now that we know the basics we can say fossil fuels come from organic matter that has decomposed under the intense pressure and heat of the Earth's crust.
hope this helps! 
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Wait u answered your own question