In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

what machine is mentioned first?, Context: Eventually, when it was more common for electric recordings to be played back electrically in the 1930s and 1940s, the overall tone was much like listening to a radio of the era. Magnetic pickups became more common and were better designed as time went on, making it possible to improve the damping of spurious resonances. Crystal pickups were also introduced as lower cost alternatives. The dynamic or moving coil microphone was introduced around 1930 and the velocity or ribbon microphone in 1932. Both of these high quality microphones became widespread in motion picture, radio, recording, and public address applications.
radio

Which of the following did not occur in the 20th century: urbanization, the spread of the Ottoman Empire, or wars?, Context: South Slavic historically formed a dialect continuum, i.e. each dialect has some similarities with the neighboring one, and differences grow with distance. However, migrations from the 16th to 18th centuries resulting from the spread of Ottoman Empire on the Balkans have caused large-scale population displacement that broke the dialect continuum into many geographical pockets. Migrations in the 20th century, primarily caused by urbanization and wars, also contributed to the reduction of dialectal differences.
spread of Ottoman Empire

Who were the Juarez brothers?, Context: In 1999, there was a double homicide in the Westside Clothing store on Lincoln Boulevard. During the incident, Culver City gang members David "Puppet" Robles and Jesse "Psycho" Garcia entered the store masked and began opening fire, killing Anthony and Michael Juarez. They then ran outside to a getaway vehicle driven by a third Culver City gang member, who is now also in custody. The clothing store was believed to be a local hang out for Santa Monica gang members. The dead included two men from Northern California who had merely been visiting the store's owner, their cousin, to see if they could open a similar store in their area. Police say the incident was in retaliation for a shooting committed by the Santa Monica 13 gang days before the Juarez brothers were gunned down.

two men from Northern California