Answer: A gas that contains more than 5% heavy hydrocarbon molecules and less than 95% methane is called a wet gas. Lean gas, on the other hand, is a kind of gas with more than 95% methane and less than 5% heavy hydrocarbons. Hydrogen sulfide is one of the most undesirable impurities in natural gas as it is toxic, corrosive, and flammable, making the gas sour. One of the most important natural gas processing steps is gas dehydration, in which the water contents are separated from the saturated gas. Therefore, the correct answer is option B.