The correct answer is Shale.
The substances that can be burn to produce carbon dioxide and energy is called fuel. The organic substances are made up of carbon and when these substances are burned to get energy is called as organic fuel.
Bones, plant roots and trees are organic fuels.
Shale is fine grained sedimentary rock which is muddy in nature. This is made up of clay minerals which is especially quartz and calcite. hale is a rock not an organic fuel.
