Which of the following is chiefly present in LPG (Liquefied Petroleum Gas)?

Liquefied Petroleum Gas (LPG) consists primarily of a flammable mixture of hydrocarbon gases. Its main constituent is butane (${\text{C}}_4{\text{H}}_{10}$), along with a smaller proportion of propane (${\text{C}}_3{\text{H}}_8$). Methane is the primary component of Natural Gas (CNG/PNG).