I need help

Methane and propane are two compounds that are composed only of carbon and hydrogen atoms. The table below shows some of the properties of these two compounds, Compound Methane Propane Formula CHA CJHB Boiling Point (C) -161.6 -42.1 Gas Density at 15.C (kg/m3) 0.68 1.9 Which of the following conclusions is best supported by the information in the table? When two elements combine, the mass of each element changes. When two compounds are mixed, the state of matter of the mixture changes. Two elements can combine to produce different substances with different properties. Two compounds can be mixed together to produce different materials with different properties