How is CNG typically produced?

Answer: C — Through the extraction of natural gas

CNG, or Compressed Natural Gas, is typically produced through the extraction of natural gas from underground reservoirs. This natural gas primarily consists of methane and is found in various formations, including shale gas deposits and conventional natural gas fields. During production, natural gas is extracted using drilling techniques and is then transported to processing plants where it is purified, separating it from impurities and other hydrocarbons. This processed natural gas can then be compressed to create CNG, which can be used as a cleaner alternative to gasoline or diesel in vehicles. The production of CNG is distinct from the other options presented. For instance, burning organic waste would generate biogas, not CNG, and processing crude oil relates to the production of gasoline or diesel rather than compressed natural gas. Compressing air is a different process entirely and does not produce CNG. Therefore, the extraction of natural gas is the foundational step that leads to the production of CNG, making it the most accurate choice among the options.