The correct option is A Methane
Methane is a chemical compound with the chemical
formula CH4 (one atom of carbon and four atoms of hydrogen).
It is a group 14 hydride and the simplest alkane, and is the main component of
natural gas.In its natural state, methane is found both below ground and under
the sea floor. When it finds its way to the surface and the atmosphere, it is
known as atmospheric methane