Final answer:
Prohibition supporters believed that alcohol fueled criminal activities and societal issues. They successfully passed the 18th Amendment in 1919 to ban intoxicating liquors, although it led to widespread illegal bootlegging.
Step-by-step explanation:
Supporters of Prohibition in the Roaring Twenties believed that alcohol was the root of C) Criminal activities. This movement was primarily driven by organizations such as the Woman's Christian Temperance Union (WCTU) and the Anti-Saloon League. They asserted that alcohol consumption contributed to various societal problems including poverty, street crime, worker absenteeism, workplace accidents, and domestic violence. The 18th Amendment, which embodied the ideals of Prohibition, was ultimately ratified in 1919, banning the manufacture, sale, and transportation of intoxicating liquors. Despite the intentions behind Prohibition, illegal bootlegging flourished, and overall it failed to bring about the sober age that Progressives had envisioned.