Answer:
B. The rapid growth of industrialization and the Great Depression.
Explanation:
Traditionally welfare programs are reserved for the war veterans. Rapid industrialization of American society requires protection of worker's housing, health conditions ad education. By the workers' compensation laws of 1929 industries became responsible for the injured and people killed during their job. Economic depression made the Federal government took the charge of insurance programs as the states and companies cannot provide in those hard times.