The British economy was already weak after WW1, so when the US stock market crashed, taxes were put on foreign imports. The value of British exports were halved, and many areas went into poverty (unemployment more than doubled) so Britain devalued their pound in 1931, which made goods cheaper and improved their economy.
I think its A. But im not really sure
End segregation in all public education. Brown v. Board of Education declared it unconstitutional to have segregated public schools leading to the desegregation of all schools following the 1954 decision.