did Slave Codes prohibited slaves from meeting in large numbers, own weapons, leave plantations, and read or write ?

Treatment was generally characterized by brutality, degradation, and inhumanity. Whippings, executions, and rapes were commonplace, and slaves were usually denied educational opportunities, such as learning how to read or write. Medical care was often provided to slaves by the slaveholder’s family or fellow slaves who had gleaned medical knowledge via ancestral folk remedies and/or experiences during their time in captivity. After well-known rebellions, such as that by Nat Turner in 1831, some states even prohibited slaves from holding religious gatherings due to the fear that such meetings would facilitate communication and possibly lead to insurrection or escape.

i thing that the best option is a.they feared it would cause a second economic collapse.

one of the most negatives aspects of the new deal was that it upset the balanced federal budget and led to a huge deficit for the nation while at the same time failed to end increasing unemployment. roosevelt's program, based on keynesian theories of economics, called for massive government spending to stimulate the economy. as he   failed to do this with large tax increases; large sums of money were borrowed to fund new deal programs. when the economy showed some improvement, roosevelt was concerned about inflation, and ordered cuts in government spending. unfortunately, he did so at a time when the new social security tax had cut people's disposable income. businesses were too afraid of spending, and the economy in 1937 was in worse shape than in 1929. at the end of that year, two million people were unemployed.

this is a good question! i'll do some research and come back when i have the answer!