Detailed Instructions: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Q: Question: How long had the process in which hydrogen peroxide processed been in development before it was patented? Passage 1:Today, hydrogen peroxide is manufactured almost exclusively by the anthraquinone process, which was formalized in 1936 and patented in 1939. It begins with the reduction of an anthraquinone (such as 2-ethylanthraquinone or the 2-amyl derivative) to the corresponding anthrahydroquinone, typically by hydrogenation on a palladium catalyst. In the presence of oxygen, the anthrahydroquinone then undergoes autoxidation: the labile hydrogen atoms of the hydroxy groups transfer to the oxygen molecule, to give hydrogen peroxide and regenerating the anthraquinone. Most commercial processes achieve oxidation by bubbling compressed air through a solution of the anthrahydroquinone, with the hydrogen peroxide then extracted from the solution and the anthraquinone recycled back for successive cycles of hydrogenation and oxidation.
 Passage 2:The Poole Harbour area has been inhabited for at least 2,500 years. During the Iron Age, Celtic people known as the Durotriges lived in Dorset, particularly around Wareham, five miles (8 km) to the west. In the 3rd century BC, these Celtic people moved from hilltop settlements, such as Maiden Castle and Badbury Rings on the chalk downs to the north, to the lower vales and heathland around the River Frome and Poole Harbour. This marshy area may have lent its name to the Durotriges, which means "water dwellers". The Durotriges engaged in cross-channel trading at Poole with the Veneti, a seafaring tribe from Brittany. The earliest significant archaeological find in the harbour is the Poole Logboat, a boat made from a single oak tree and dating to 295 BC. During that time, the harbour was shallower than it is today and any settlement would now be under water.
 Passage 3:The Los Angeles County Metropolitan Transportation Authority (LA Metro) operates the Blue Line, a light rail service that runs between the Downtown Long Beach Station (known as the Transit Mall Station until July 2013) and the 7th Street/Metro Center station in downtown Los Angeles. From the 7th Street/Metro Center Station, passengers can make connections to Hollywood, Union Station, Pasadena, East LA, Universal Studios, Chinatown, and other points of interest along the Los Angeles Metro Rail network. From Union Station in downtown L.A., transit users can access the regional Metrolink (Southern California) rail system to access a vast area of urban Southern California, and connect to nationwide Amtrak trains as well. The Metro Blue Line also offers connections to the Metro Expo Line at both the 7th Street/Metro Center Station and Pico Station with service to Santa Monica. In addition, at Willowbrook Station, passengers can transfer to the Metro Green Line with service to Redondo Beach, Norwalk, and Los Angeles International Airport via an additional shuttle connection. The Metro Blue Line Maintenance Shops are also in Long Beach just south of the Del Amo Blue Line station.

A:
1