Concept:Natural gas is a fossil fuel mixture of light hydrocarbons, with one component present in the highest proportion.Explanation:Natural gas consists mainly of methane, CH4.Methane is the simplest alkane with one carbon atom and four hydrogen atoms.It usually makes up over 90% of the total natural gas composition.The other gases such as ethane, propane, and butane are present in smaller amounts.Therefore, the primary component is methane.Answer:B. methane