<h3>C.In such conditions, oxygen was available in abundance.</h3><h3>Explanation:</h3>
Oil and natural gas were produced from the remains of prehistoric plants and animals that’s why they've described fossil fuels. Hundreds of millions of years ago, ancient plant and animal resides resolved into the seas along with sand, silt, and rocks. As the rocks and silt ended, layer upon layer bunched up in rivers, with coastlines and on the sea floor deceiving the organic material. Outwardly air, the primary layers could not decay off.
