If we're looking at which political party dominated in the 1920s—the Republicans—then, B would be the most correct answer. The 1920s saw the presidencies of Warren G. Harding, Calvin Coolidge, and Herbert Hoover. Hoover was an avowed proponent of free markets, which is partly the reason why he refused to intervene in the troubled wheat market on the eve of the Great Depression. Hoover's laissez-faire economics philosophy worked fine during the prosperous and pro-business 1920s, but his unwillingness to provide more government support to protect citizens from the brutal effects of the Great Depression permanently marred his presidency.
The 1920s are best described as a decade that was both forward-looking and backward-looking. Changes in the culture, such as the popularity of jazz, as well as more fluid expressions of gender and sexuality, make it look like a very progressive era. It's also very important to note that the 19th Amendment was passed on August 18, 1920, granting women the right to vote. However, the 1920s also saw a revival of the Ku Klux Klan and an unprecedented number of lynchings in the South. It was a decade in which people were still keen on believing in racist pseudoscience, while it was also the era of the Harlem Renaissance, in which key figures, such as Marcus Garvey and W.E.B. DuBois, were pushing for more political rights and autonomy for black communities.