Natural gas is composed mostly of methane, but it also contains small amounts of ethane, propane, butane, and pentane. Methane, a combination of hydrogen and carbon, is formed when plants and animals (organic matter) are trapped beneath the sedimentary layers of the earth.
It would be A. Solid-gas temperature increases ( think of a block of ice, you have to increase temperature to make it melt, then the water would evaporate into a gas)
look at the atomic number using the periodic table. The Atomic number equals the amount of protons and the amount of protons equals the amount of electrons
