Which of these ideas would supporters of the plessy v. ferguson ruling most likely have agreed with? that social rights were a part of civil rights that the constitution should be interpreted without regard to race that “separate but equal” was a valid legal doctrine that "separate but equal" did not justify racial segregation

The correct alternative is: that "separate but equal" was a valid legal doctrine.

The Plessy v. Ferguson case has decided that racial segregation wasn't a violation of the 14th Amendment to the United States Constitution, in which was said that all citizens were equal before the law. Therefore, the court ruled that in public spaces the "separate but equal" doctrine should exist.

C is the answer

martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.