The southern Black Codes:
A) allowed the arrest on vagrancy charges of former slaves who failed to sign yearly labor contracts.
B) allowed former slaves to testify in court against whites and to serve on juries.
C) were some of the first laws adopted as part of Radical Reconstruction in 1867.
D) were denounced by President Johnson and declared unconstitutional by the Supreme Court.
E) pleased northerners because they saw that the rule of law was returning to the South

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.

donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

hope this !

i googled "who was kolson johanson" and this is the answer i found.

sorry if this is incorrect.