After vasco da gama rounded the cape of good hope and reached southwest india, the portuguese
a. discovered that european trade with india was monopolized by spain.
b. realized that muslim traders could not communicate with portuguese interpreters.
c. discovered a new culture that had never traded with silk road merchants.
d. established trading forts in india, africa, and china.

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.