The correct option is C methane, ethane, propane and butane.
Liquefied Petroleum Gas or LPG (also called Autogas) consists mainly of propane, propylene, butane, and butylene in various mixtures.It is produced as a by-product of natural gas processing and petroleum refining. The components of LPG are gases and will evaporate at normal temperatures and pressures, as a result it is stored in pressurised steel bottles. Unlike natural gas, LPG is heavier than air, and thus will flow along floors and tend to settle in low spots, such as basements.Such accumulations can cause explosion hazards.