Where would an American in the 1920s have gone to enjoy "talkies"?
to a speakeasy
to a movie theater
to a department store
to a home with a radio

They Would Go To A Home With a Radio.

Explanation:

Because it was the cheapest and easiest way

Im in between theater and department store

Photoplay was founded in Chicago in 1911 and reached its zenith in the 1920s and 1930s, becoming quite influential in the early film industry.  The magazine was renowned for its beautiful cover portraits of film stars by artists such as Rolf Armstrong, Earl Christy, and Charles Sheldon. By 1937, however, with the advancement of color photography, the magazine began using photographs of the stars.

Young Myrna Loy, who first worked in silent films. “It was a dreadful time, believe me,” explained actress Myrna Loy to New York Times writer Guy Flatley in 1977, then writing a magazine piece at the 50th anniversary of sound in film.  “There was panic everywhere,” said Loy, “and a lot of people said, ‘This is ridiculous!  Who wants to hear people talk?'”  Loy added that many people at the time still “loved the silent film, the great art of pantomime perfected by the comedians and by [director, D.W.] Griffith.”  So much of what happened with the coming of sound “was terribly unfair,” Loy charged.  The studios, she believed, “should have taken the time to train those people whose voices didn’t match their screen images”

    And indeed, for actors and actresses like Norma Talmadge, shown on Photoplay’s cover, the problem was the sound of their voices.  Often, it seemed, the image and voice didn’t match up to what audiences had already cast in their minds and expected, and that’s what touched off the panic among many actors and actresses, ruining some careers.  

Late 1920s studio ad touting King Vidor’s ‘Big Parade’ & others.  King Vidor was a well known director in Hollywood with a career that began in 1919 and continued to thrive well into the 1950s.  In the silent era, The Big Parade of 1925 was his biggest hit, a romance epic, starring John Gilbert.  The Crowd of 1928 was another of his films, considered one of the greats from the silent era.  He also did La Boheme (1926), Show People (1928) and others.  His first sound film, Hallelujah of 1929, was nominated for an Oscar.  He also did a number of others, including “The Champ” (1931), “Our Daily Bread” (1934), and “The Citadel” (1938).  Vidor also directed some sequences in The Wizard of Oz (1939), including the famous “Somewhere Over the Rainbow” number.  In later years his films included Duel In the Sun (1946), The Fountainhead (1949) and War and Peace (1955).

a is the answer because it just is

the answer is:

c. economic output