Final answer:
The factor that contributed to the market crash of 1929 was rapid, high-volume trading with minimal regulatory oversight leading to a panic-driven sell-off.
Step-by-step explanation:
The market force that contributed to the market crash in 1929 was C. rapid, high-volume trading, with little regulation or oversight. This lack of regulation resulted in risky investment behaviors, such as buying stocks on margin, which inflated the stock market. When the market turned, these practices exacerbated the crash as investors scrambled to sell off their holdings, leading to a widespread panic.
The speculation bubble in stock trading, the contagion effect of panic, and extreme public confidence with limited ability to absorb market volatility are seen as central factors among multiple reasons that led to the precipitous market decline during the Great Depression.