Answer: C. Materialism
Materialism is one of the main objects of critique of the writers of the "Lost Generation." These authors wrote in the context of the post-war period, a period of wealth and "progress" for the United States. With the rising quality of life came rising materialism and consumerism. The authors argued that these were not only damaging to culture, but also to the human soul, which was unable to focus on the things that really matter in life.