The observation that iq variations between african americans and whites in the united states is due to socioeconomic and not genetic factors is based on
a. differences in the scores of other minorities and whites in the united states.
b. similarities in the scores of other deprived ethnic minorities in other countries.
c. research reported in the book the bell curve.
d. recognition that iq tests are not accurate measures of intelligence.

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.

b

make me