Final answer:
Roosevelt's fireside chats provided a calming and optimistic influence on the American public, helping to foster support for his New Deal policies and restore consumer confidence during the Great Depression.
Step-by-step explanation:
Franklin D. Roosevelt's fireside chats had a significant impact on the American public, primarily by calming Americans and offering them a sense of optimism during the Great Depression. Option c) Roosevelt's fireside chats calmed Americans and gave them a sense of optimism, most accurately describes the effect of Roosevelt's radio addresses. The chats allowed Roosevelt to explain complex policies and reassure the nation in simple terms, fostering a sense of confidence and support for his New Deal policies. His radio addresses spanned from 1933 to 1944, with the first chat significantly restoring consumer confidence and leading to nearly $1 billion being redeposited in the nation's banks. These fireside chats streamlined communication between the president and the public, providing a strong foundation of trust and encouragement.