Final answer:
The Plessy v. Ferguson decision resulted in legalized segregation in the South, which was later overturned by the Brown v. Board of Education decision in 1954.
Step-by-step explanation:
The result of the Plessy v. Ferguson decision in the South was c) Legalized segregation. This ruling by the United States Supreme Court established the principle of "separate but equal", which became a legal justification for segregating all aspects of public life, including schooling, transportation, and lodging. This segregation policy was pervasive particularly in the southern United States and led to a system known as Jim Crow laws. Facilities for African Americans during this period were generally inferior despite the ruling's stipulation that segregated facilities be equal. This doctrine of separate but equal was not overturned until the landmark Brown v. Board of Education decision in 1954, which found that separate educational facilities were inherently unequal and began the process of desegregating public schools.