Answer: I believe the answer is B. Laissez-faire economics.
Step-by-step explanation:
Laissez-faire was most definitely the government's economic policy before the Great Depression, because the Laissez-faire theory is basically a theory that states that the government should not intervene in the economy, with an exception to protecting the people's inalienable rights. This is exactly what happened before the Depression; the government let businesses do as they pleased, which led to the collapse of the stock market and then the Great Depression. To address the other choices: Keynesian economics is what helped the economy get back to its feet and ended the Great Depression. As for Socialist economics, the U.S. never incorporated socialist economics before the Great Depression.