How did FDR cause African Americans to change party allegiance?

A. Allowing them to join the Republican Party for the first time

B. Becoming a member of the party that had freed the slaves

C. Creating the "black cabinet," which gave African Americans a role
in shaping public policy

D. Passing legislation that allowed African Americans to vote in
presidential elections

i believe the answer is:

-   william jennings bryan is a democrat while mckinley was a republican

at that time, the segment of population that choose for democratic party were the voters with low economic background and vice versa

- william jennings has support of populists and wants to have inflation to farmers while mckinley has support of bankers and businessmen , doesn't want inflation

the fixed value of gold make the large business able to stack up their gold without   being worried that it would devaluated.

- william jennings supported the silver standard while mckinley supported the gold standard

according to jenning, using other metal beside gold could the poor people to have more purchasing power and them advance in the society.