I believe the answer is: C.separate rail facilities
In Plessy v. Ferguson, the problem revolves around the racial segregation that banned the African American citizens from using the Same facility as the White citizens . specifically the use of rail facilities. At that time, the supreme court ruled in favour of racial segregation.
The subject of the Louisiana laws that was upheld by Plessy v. Ferguson was the separate rail facilities
The case revolves around the racial segregation that banned the African American citizens from using the same facility as the white citizens especially the rail facilities.
In this case, the supreme court ruled in favor of racial segregation.
Therefore, the Option C is correct.
Read more about Plessy case
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