It is the excessive use of credit. The shares trading system crash of 1929 touched off a chain of occasions that dove the United States into its longest, most profound monetary emergency in its history. It is awfully shortsighted to see money markets crash as the single reason for the Great Depression. A solid economy can recuperate from such a compression.
Answer: C. By appealing to logic that most people desire to live together, but those that disagree are illogical and are destroying the forward movement to end prejudice behavior and voluntary segregation.