Question: What colorless fammable gas does Dedar Bayou manufacture?

Context paragraphs:
Ethylene: Ethylene (IUPAC name: ethene) is a hydrocarbon which has the formula C2H4 or HC=CH.  It is a colorless flammable gas with a faint "sweet and musky" odour when pure.  It is the simplest alkene (a hydrocarbon with carbon-carbon double bonds).

Cedar Bayou plant: Cedar Bayou plant is a petrochemical manufacturing facility located in Baytown, Texas.  It is the largest U.S. manufacturing facility of Chevron Phillips Chemical Company.  The plant operates seven process units on approximately 1,400 acres producing Ethylene, Propylene, Normal Alpha Olefins (NAO), High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE), and Polyalphaolefins.  Cedar Bayou plant opened in 1963 as Gulf Oil and was sold to Chevron Corp. in 1985.  In 2000, Chevron Corp. and Phillips 66 merged their chemical businesses to form Chevron Phillips Chemical Company.

Bayou Teche National Wildlife Refuge: Bayou Teche National Wildlife Refuge is located in the coastal towns of Franklin, Garden City and Centerville on Bayou Teche in Louisiana, USA.  The 9028 acre refuge is forested with bottomland hardwoods and cypress-gum forests.  The refuge was established in St. Mary Parish in 2001.  The surrounding area includes oil and gas wells and canals.

Hexanoic acid: Hexanoic acid (caproic acid) is the carboxylic acid derived from hexane with the molecular formula CHCOOH.  It is a colorless oily liquid with an odor that is fatty, cheesy, waxy, and like that of goats or other barnyard animals.  It is a fatty acid found naturally in various animal fats and oils, and is one of the chemicals that give the decomposing fleshy seed coat of the ginkgo its characteristic unpleasant odor.  It is also one of the components of vanilla.  The primary use of hexanoic acid is in the manufacture of its esters for artificial flavors, and in the manufacture of hexyl derivatives, such as hexylphenols.

Golden Meadow, Louisiana: Golden Meadow is a town along Bayou Lafourche in Lafourche Parish, Louisiana, United States.  The population was 2,193 at the 2000 census.  It is part of the Houma–Bayou Cane–Thibodaux Metropolitan Statistical Area.  Its main source of revenue is from excessive speeding tickets, property tax, sales tax, and from the oil and gas industry.  The fishing and seafood industries also have strong economic impacts, with charter fishing, restaurants, and lodging actively serving patrons.  The town was once known as a speed trap, but it has since been bypassed by Hwy 3235 and city traffic has been reduced to mostly locals.  As in other places in Louisiana, there is a noticeable presence of Cajun culture, music, and cuisine.

Gas: Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).  A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide).  A gas mixture would contain a variety of pure gases much like the air.  What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles.  This separation usually makes a colorless gas invisible to the human observer.  The interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image.  One type of commonly known gas is steam.

Trimethylamine: Trimethylamine (TMA) is an organic compound with the formula N(CH).  This colorless, hygroscopic, and flammable tertiary amine has a strong "fishy" odor in low concentrations and an ammonia-like odor at higher concentrations.  It is a gas at room temperature but is usually sold in pressurized gas cylinders or as a 40% solution in water.  TMA is a nitrogenous base and can be readily protonated to give trimethylammonium cation.  Trimethylammonium chloride is a hygroscopic colorless solid prepared from hydrochloric acid.  Trimethylamine is a good nucleophile, and this reaction is the basis of most of its applications.

Dichlorodifluoromethane: Dichlorodifluoromethane (R-12) is a colorless gas usually sold under the brand name Freon-12, and a chlorofluorocarbon halomethane (CFC) used as a refrigerant and aerosol spray propellant.  Complying with the Montreal Protocol, its manufacture was banned in developed countries (non-article 5 countries) in 1996, and developing countries (article 5 countries) in 2010 due to concerns about its damaging impact to the ozone layer.  Its only allowed usage is as fire retardant in submarines and aircraft.  It is soluble in many organic solvents.  Dichlorodifluoromethane was one of the original propellants for Silly String.  R-12 cylinders are colored white.

Liquefied natural gas: Liquefied natural gas (LNG) is natural gas (predominantly methane, CH, with some mixture of ethane CH) that has been converted to liquid form for ease and safety of non-pressurized storage or transport.  It takes up about 1/600th the volume of natural gas in the gaseous state (at standard conditions for temperature and pressure).  It is odorless, colorless, non-toxic and non-corrosive.  Hazards include flammability after vaporization into a gaseous state, freezing and asphyxia.  The liquefaction process involves removal of certain components, such as dust, acid gases, helium, water, and heavy hydrocarbons, which could cause difficulty downstream.  The natural gas is then condensed into a liquid at close to atmospheric pressure by cooling it to approximately -162 °C ; maximum transport pressure is set at around 25 kPa .

LaBelle, Texas: LaBelle is an unincorporated community on Taylor Bayou and FM 365, ten miles south of Beaumont, in central Jefferson County, Texas, United States.  It is part of the Beaumont–Port Arthur Metropolitan Statistical Area.  Although officially recognized settlers had lived in the Taylor Bayou area since the 1830s, a post office was not established at the community known as Lower Taylor's Bayou until 1888.  In that year new postmaster J. E. Broussard named the post office LaBelle in honor of his fiancee, Mary Bell Bordages.  The area's first school was probably started by Leo (Peg Leg) Craigen, near what later became the Port Arthur Country Club.  Located in the fertile but flood-prone prairies of the upper Texas Gulf Coast, LaBelle was the site of one of several pumping stations designed to control flooding and drainage along Taylor Bayou.  Because of its somewhat isolated location, the LaBelle post office was discontinued in 1914.  Local schools were consolidated with those of the town of Fannett in 1923.  Fourteen years later, however, the discovery of large quantities of oil and natural gas at the LaBelle oilfield, five miles south of the community, sparked new interest in the area.  Scattered residences, the pumping station, and oilfields and gas lines to the south marked the LaBelle community on maps during the mid-1970s.

Supporting paragraphs: Cedar Bayou plant Ethylene
Answer: Ethylene