C is the answer, i know this is late but it can at least help some one else maybe
Flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground Advantages<span> & Disadvantages of </span>Natural Gas<span>. </span>Natural gas <span>burns cleaner than other fossil fuels, producing half the carbon dioxide as coal and about a third less than oil. It also emits fewer amounts of toxic chemicals like nitrogen oxides and sulfur dioxide.</span>
The raw sugar industry has made about $378m in Cuban exports while the coffee growing industry at it's peak had only made $21.5m hope this helps
