Answer:
After World War II, the United States entered a period of material abundance (option B). The post-war era brought economic prosperity and a significant increase in production and consumption. This period, known as the "post-war boom" or "Golden Age," was characterized by a rise in middle-class living standards, a booming economy, and technological advancements. The United States saw a surge in consumerism, as people had more disposable income and access to a wide range of goods and services. The expansion of the culture of consumerism (option B) was a prominent feature of the 1950s, where the emphasis on buying and owning consumer goods became a symbol of progress and success.