Final answer:
The creation of the Federal Deposit Insurance Corporation (FDIC) in 1933, as part of Roosevelt's New Deal, provided insurance for bank deposits and helped restore confidence in the banking system.
Step-by-step explanation:
The New Deal, introduced by President Franklin D. Roosevelt to tackle the Great Depression, included several programs to restore confidence in the nation's banks. One such program was the creation of the Federal Deposit Insurance Corporation (FDIC) in 1933, which was established to ensure that people's deposits in banks were protected. The FDIC provided insurance for bank deposits, starting with coverage for up to $2,500 which eventually increased over time. This introduction of federal deposit insurance helped to greatly reduce the occurrences of bank runs and to restore trust in the financial system. The other options mentioned, namely the Social Security Act, the Securities and Exchange Commission (SEC), and the Tennessee Valley Authority (TVA) also played significant roles in reforming different aspects of the economy and society, but they did not provide the function of insuring bank deposits.